diff --git a/README.md b/README.md
index 884dc2c..a47835f 100644
--- a/README.md
+++ b/README.md
@@ -6,4 +6,7 @@
 - Day 4: 7:08 but top 100 required 3:33 still okay
 - Day 5: 11:56 but 7:58 for top 100... getting better?
 - Day 6: 3:50 but 2:25 for leaderboard :D
-- Day 7: 
+- Day 7: 27:55 and 14:47 for leaderboard; okay, I would say
+- Day 8: 61:00 and 10:00 for leaderboard; I need template code for searching coordinate systems
+- Day 9: 58:00 and 7:32 for leaderboard; I need code for 2D stuff
+- Day 10:
diff --git a/d7.py b/d7.py
new file mode 100644
index 0000000..6b92bd4
--- /dev/null
+++ b/d7.py
@@ -0,0 +1,117 @@
+import re
+from string import ascii_lowercase, ascii_uppercase, digits
+
+EXAMPLE = """
+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k
+"""
+
+def clean(text: str) -> list[str]:
+    return list(filter(lambda l: l.strip() != "", text.splitlines()))
+
+def solve(lines: list[str]):
+    sizes = {}
+    res = 0
+
+    current_dir = ()
+    for line in lines:
+        if line.startswith("$ cd"):
+            c = line.replace("$ cd ", "").strip()
+            if c == "..":
+                current_dir = tuple(list(current_dir)[:-1])
+            else:
+                current_dir = tuple(list(current_dir) + [c])
+        elif line[0] in digits:
+            size, _ = line.split()
+            size = int(size)
+            try:
+                sizes[current_dir] += size
+            except KeyError:
+                sizes[current_dir] = size
+
+            for i in range(1, len(current_dir)):
+                outer_dir = tuple(list(current_dir)[:-i])
+                try:
+                    sizes[outer_dir] += size
+                except KeyError:
+                    sizes[outer_dir] = size
+
+    for _, size in sizes.items():
+        if size <= 100000:
+            res += size
+    # 23:50
+    return res
+
+def solve2(lines: list[str]):
+    sizes = {}
+    res = 0
+
+    current_dir = ()
+    for line in lines:
+        if line.startswith("$ cd"):
+            c = line.replace("$ cd ", "").strip()
+            if c == "..":
+                current_dir = tuple(list(current_dir)[:-1])
+            else:
+                current_dir = tuple(list(current_dir) + [c])
+        elif line[0] in digits:
+            size, _ = line.split()
+            size = int(size)
+            try:
+                sizes[current_dir] += size
+            except KeyError:
+                sizes[current_dir] = size
+
+            for i in range(1, len(current_dir)):
+                outer_dir = tuple(list(current_dir)[:-i])
+                try:
+                    sizes[outer_dir] += size
+                except KeyError:
+                    sizes[outer_dir] = size
+    total_space = 70000000
+    unused_space = 30000000
+    used_space = sizes[("/",)]
+
+    res = 2**32
+    for _, size in sizes.items():
+        if total_space - used_space + size >= unused_space and size < res:
+            res = size
+    # 27:55
+    return res
+
+def main():
+    example = clean(EXAMPLE)
+    print("Example  1:", solve(example))
+
+    data = clean(open("i7.txt").read())
+    print("Solution 1:", solve(data))
+
+    example = clean(EXAMPLE)
+    print("Example  2:", solve2(example))
+
+    data = clean(open("i7.txt").read())
+    print("Solution 2:", solve2(data))
+
+if __name__ == "__main__":
+    main()
diff --git a/d8.py b/d8.py
new file mode 100644
index 0000000..f1a5c39
--- /dev/null
+++ b/d8.py
@@ -0,0 +1,132 @@
+import re
+from string import ascii_lowercase, ascii_uppercase
+
+EXAMPLE = """
+30373
+25512
+65332
+33549
+35390
+"""
+
+def clean(text: str) -> list[str]:
+    return list(filter(lambda l: l.strip() != "", text.splitlines()))
+
+
+def is_visible(trees, y_tree, x_tree):
+    y_max = len(trees)
+    x_max = len(trees[0])
+    tree_height = trees[y_tree][x_tree]
+
+    for x in range(0, x_tree):
+        if trees[y_tree][x] >= tree_height:
+            break
+    else:
+        return True
+
+    for x in range(x_tree + 1, x_max):
+        if trees[y_tree][x] >= tree_height:
+            break
+    else:
+        return True
+
+    for y in range(0, y_tree):
+        if trees[y][x_tree] >= tree_height:
+            break
+    else:
+        return True
+
+    for y in range(y_tree + 1, y_max):
+        if trees[y][x_tree] >= tree_height:
+            break
+    else:
+        return True
+    return False
+
+def solve(lines: list[str]):
+    res = 0
+    trees = []
+    for i in range(len(lines)):
+        line = lines[i]
+        trees.append(list(map(int, line)))
+
+    for y in range(len(trees)):
+        for x in range(len(trees)):
+            if is_visible(trees, y, x):
+                res += 1
+            else:
+                pass
+    return res
+
+
+def scenic_score(trees, y_tree, x_tree):
+    y_max = len(trees)
+    x_max = len(trees[0])
+
+    if x_tree == 0 or y_tree == 0 or x_tree == x_max - 1 or y_tree == y_max - 1:
+        return 0
+
+    tree_height = trees[y_tree][x_tree]
+    left, right, up, down = 0, 0, 0, 0
+
+    for x in range(x_tree - 1, -1, -1):
+        if trees[y_tree][x] < tree_height:
+            left += 1
+        else:
+            left += 1
+            break
+
+    for x in range(x_tree + 1, x_max):
+        if trees[y_tree][x] < tree_height:
+            right += 1
+        else:
+            right += 1
+            break
+
+    for y in range(y_tree - 1, -1, -1):
+        if trees[y][x_tree] < tree_height:
+            up += 1
+        else:
+            up += 1
+            break
+
+    for y in range(y_tree + 1, y_max):
+        if trees[y][x_tree] < tree_height:
+            down += 1
+        else:
+            down += 1
+            break
+
+    score = up * down * left * right
+    # print(f"{y_tree=} {x_tree=} {left=} {right=} {up=} {down=} {score=}")
+    return score
+
+def solve2(lines: list[str]):
+    trees = []
+    for i in range(len(lines)):
+        line = lines[i]
+        trees.append(list(map(int, line)))
+
+    max_score = 0
+    for y in range(len(trees)):
+        for x in range(len(trees)):
+            score = scenic_score(trees, y, x)
+            if score > max_score:
+                max_score = score
+    return max_score
+
+def main():
+    example = clean(EXAMPLE)
+    print("Example  1:", solve(example))
+
+    data = clean(open("i8.txt").read())
+    print("Solution 1:", solve(data))
+
+    example = clean(EXAMPLE)
+    print("Example  2:", solve2(example))
+
+    data = clean(open("i8.txt").read())
+    print("Solution 2:", solve2(data))
+
+if __name__ == "__main__":
+    main()
diff --git a/d9.py b/d9.py
new file mode 100644
index 0000000..8b6825e
--- /dev/null
+++ b/d9.py
@@ -0,0 +1,128 @@
+EXAMPLE = """
+R 4
+U 4
+L 3
+D 1
+R 4
+D 1
+L 5
+R 2
+"""
+
+def clean(text: str) -> list[str]:
+    return list(filter(lambda l: l.strip() != "", text.splitlines()))
+
+def new_pos(h_pos, t_pos, dir):
+    if dir == "R":
+        new_h_pos = (h_pos[0] + 1, h_pos[1])
+    elif dir == "U":
+        new_h_pos = (h_pos[0], h_pos[1] + 1)
+    elif dir == "L":
+        new_h_pos = (h_pos[0] - 1, h_pos[1])
+    elif dir == "D":
+        new_h_pos = (h_pos[0], h_pos[1] - 1)
+    elif dir == "NONE":
+        new_h_pos = (h_pos[0], h_pos[1])
+    else:
+        raise Exception("Unexpected direction.")
+
+    #  xxxxx
+    #  x---x     
+    #  x-O-x          
+    #  x---x   
+    #  xxxxx
+    dx, dy = t_pos[0] - new_h_pos[0], t_pos[1] - new_h_pos[1]
+    delta = {
+        (-1, -1): (0, 0),
+        (-1, 0): (0, 0),
+        (-1, 1): (0, 0),
+        (0, -1): (0, 0),
+        (0, 0): (0, 0),
+        (0, 1): (0, 0),
+        (1, -1): (0, 0),
+        (1, 0): (0, 0),
+        (1, 1): (0, 0),
+        (-2, 2): (1, -1),
+        (-2, 1): (1, -1),
+        (-2, 0): (1, 0),
+        (-2, -1): (1, 1),
+        (-2, -2): (1, 1),
+        (2, 2): (-1, -1),
+        (2, 1): (-1, -1),
+        (2, 0): (-1, 0),
+        (2, -1): (-1, 1),
+        (2, -2): (-1, 1),
+        (-1, 2): (1, -1),
+        (-1, -2): (1, 1),
+        (0, 2): (0, -1),
+        (0, -2): (0, 1),
+        (1, 2): (-1, -1),
+        (1, -2): (-1, 1),
+    }
+    dx_, dy_ = delta[(dx, dy)]
+    new_t_pos = t_pos[0] + dx_, t_pos[1] + dy_
+    # print(f"{h_pos=} {t_pos=} {dir=}")
+    # print(f"{new_h_pos=} {dx=} {dy=}")
+    # print(f"{new_t_pos=}")
+    # print("----")
+    return new_t_pos, new_h_pos
+
+def solve(lines: list[str]):
+    pos = set()
+    h_pos = (0, 0)
+    t_pos = (0, 0)
+    pos.add(t_pos)
+    for i in range(len(lines)):
+        dir, amount = lines[i].split()
+        for _ in range(int(amount)):
+            t_pos, h_pos = new_pos(h_pos, t_pos, dir)
+            pos.add(t_pos)
+    # 44:00
+    return len(pos)
+
+EXAMPLE2 = """
+R 5
+U 8
+L 8
+D 3
+R 17
+D 10
+L 25
+U 20
+"""
+
+def solve2(lines: list[str]):
+    vis = set()
+    poss = [(0, 0) for _ in range(10)]
+    vis.add((0, 0))
+    for i in range(len(lines)):
+        dir, amount = lines[i].split()
+        for _ in range(int(amount)):
+            for i in range(len(poss) - 1):
+                h_pos = poss[i]
+                t_pos = poss[i + 1]
+                if i == 0:
+                    t_pos, h_pos = new_pos(h_pos, t_pos, dir)
+                else:
+                    t_pos, h_pos = new_pos(h_pos, t_pos, "NONE")
+                poss[i] = h_pos
+                poss[i + 1] = t_pos
+            vis.add(poss[-1])
+    # 58:00
+    return len(vis)
+
+def main():
+    example = clean(EXAMPLE)
+    print("Example  1:", solve(example))
+
+    data = clean(open("i9.txt").read())
+    print("Solution 1:", solve(data))
+
+    example = clean(EXAMPLE2)
+    print("Example  2:", solve2(example))
+
+    data = clean(open("i9.txt").read())
+    print("Solution 2:", solve2(data))
+
+if __name__ == "__main__":
+    main()
diff --git a/dx.py b/dx.py
new file mode 100644
index 0000000..ed32b04
--- /dev/null
+++ b/dx.py
@@ -0,0 +1,39 @@
+import re
+from string import ascii_lowercase, ascii_uppercase
+
+EXAMPLE = """
+"""
+
+def clean(text: str) -> list[str]:
+    return list(filter(lambda l: l.strip() != "", text.splitlines()))
+
+def solve(lines: list[str]):
+    res = 0
+    for i, line in enumerate(lines):
+        print(i, line)
+    return res
+
+def solve2(lines: list[str]):
+    res = 0
+    for i, line in enumerate(lines):
+        print(i, line)
+    return res
+
+def main():
+    example = clean(EXAMPLE)
+    print("Example  1:", solve(example))
+    return
+
+    data = clean(open("i6.txt").read())
+    print("Solution 1:", solve(data))
+    return
+
+    example = clean(EXAMPLE)
+    print("Example  2:", solve2(example))
+    return
+
+    data = clean(open("i6.txt").read())
+    print("Solution 2:", solve2(data))
+
+if __name__ == "__main__":
+    main()
diff --git a/i7.txt b/i7.txt
new file mode 100644
index 0000000..4c660fb
--- /dev/null
+++ b/i7.txt
@@ -0,0 +1,1044 @@
+$ cd /
+$ ls
+dir dscbfp
+283653 fsdfddfv
+dir mjzqq
+241330 rcm.psp
+dir sjbpgc
+dir zfsbvs
+$ cd dscbfp
+$ ls
+dir fgtvzpl
+dir hgfrgbv
+dir hmwqgjnl
+dir jvr
+dir lcvdgm
+dir mmhtpz
+dir wqc
+dir znl
+dir zph
+dir zwlpm
+$ cd fgtvzpl
+$ ls
+dir fvrghzfg
+28513 lbbg.rhq
+$ cd fvrghzfg
+$ ls
+212295 cjb.nwg
+dir ftqs
+$ cd ftqs
+$ ls
+250415 mmhtpz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd hgfrgbv
+$ ls
+86365 cdrgnzrz.hwf
+175318 wqtmwb
+$ cd ..
+$ cd hmwqgjnl
+$ ls
+dir dscbfp
+dir dwtfrgj
+130223 fnl.whg
+66339 mtcv
+dir rgvvz
+$ cd dscbfp
+$ ls
+146043 wpzr
+$ cd ..
+$ cd dwtfrgj
+$ ls
+dir jwmw
+dir pntqg
+$ cd jwmw
+$ ls
+dir dscbfp
+243410 lbbg.phv
+dir mmhtpz
+$ cd dscbfp
+$ ls
+dir mmhtpz
+$ cd mmhtpz
+$ ls
+dir mdrddz
+$ cd mdrddz
+$ ls
+167704 fgjsq.bpb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mmhtpz
+$ ls
+233626 dtcmsq.pdl
+163642 jczs.rgg
+111667 msfmjd.vlr
+23137 ndhvh.jbq
+$ cd ..
+$ cd ..
+$ cd pntqg
+$ ls
+68578 lnjvpcgq.zqs
+62492 rcm.psp
+$ cd ..
+$ cd ..
+$ cd rgvvz
+$ ls
+dir hmwqgjnl
+dir jrjgnch
+110656 lnjvpcgq.zqs
+206537 mmhtpz.wgd
+198736 msfmjd.vlr
+110172 rrl.wqz
+dir wrb
+$ cd hmwqgjnl
+$ ls
+141962 bsgljmww.whq
+dir hsmr
+123313 msfmjd.vlr
+223573 rcm.psp
+$ cd hsmr
+$ ls
+229737 fzptbrzb.lqv
+$ cd ..
+$ cd ..
+$ cd jrjgnch
+$ ls
+4426 lbbg.fzh
+dir zbnp
+$ cd zbnp
+$ ls
+65658 cjqbfv.fjf
+270282 pwv.bcz
+$ cd ..
+$ cd ..
+$ cd wrb
+$ ls
+dir fgwnpp
+249291 lbbg
+dir mbd
+dir rdnf
+dir rgvvz
+dir rnrr
+dir vzjh
+$ cd fgwnpp
+$ ls
+dir gdfrtgl
+230060 lbbg.qfm
+275250 rbd.fqj
+dir zlgpdb
+$ cd gdfrtgl
+$ ls
+dir gvw
+dir rgvvz
+$ cd gvw
+$ ls
+123285 mmhtpz.vbl
+167405 qhfqz
+$ cd ..
+$ cd rgvvz
+$ ls
+254625 rcm.psp
+$ cd ..
+$ cd ..
+$ cd zlgpdb
+$ ls
+72966 cjjl.wzp
+217828 ndhvh.jbq
+141199 wbnl.qdc
+$ cd ..
+$ cd ..
+$ cd mbd
+$ ls
+dir hmwqgjnl
+$ cd hmwqgjnl
+$ ls
+13420 mmhtpz.snz
+$ cd ..
+$ cd ..
+$ cd rdnf
+$ ls
+dir frqb
+dir jjjzcjdh
+dir mwpd
+dir nvz
+152893 rcm.psp
+$ cd frqb
+$ ls
+dir dscbfp
+231903 gwlj.lgn
+dir mmhtpz
+298674 nhc.hpl
+193867 rfmv.dzd
+dir sqt
+$ cd dscbfp
+$ ls
+280820 rgvvz.glj
+$ cd ..
+$ cd mmhtpz
+$ ls
+137192 jczs.rgg
+273426 rcm.psp
+$ cd ..
+$ cd sqt
+$ ls
+dir fwvgbgbs
+245416 rgvvz.cgh
+12489 wnjgq
+$ cd fwvgbgbs
+$ ls
+dir mfpd
+170052 msfmjd.vlr
+278273 mwr.stv
+177661 vgwstqlt.zml
+$ cd mfpd
+$ ls
+264130 gmwhsj.jvp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jjjzcjdh
+$ ls
+dir cnjnnzw
+dir flprjhlm
+266398 fqclzm.mfw
+dir gftmlvmh
+113237 jgnmbml.rnr
+148723 ljfg.vmc
+237722 rrzvq.cqr
+$ cd cnjnnzw
+$ ls
+231497 ldqdwn.bvf
+$ cd ..
+$ cd flprjhlm
+$ ls
+185486 hmwqgjnl.jdn
+$ cd ..
+$ cd gftmlvmh
+$ ls
+dir blpt
+41840 qbr.tjw
+$ cd blpt
+$ ls
+dir sbtg
+$ cd sbtg
+$ ls
+7518 wsh.vrp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mwpd
+$ ls
+35589 flgh
+$ cd ..
+$ cd nvz
+$ ls
+147018 mpmcpwnl.hqg
+$ cd ..
+$ cd ..
+$ cd rgvvz
+$ ls
+280057 dhwzlmgn
+156280 gmzvl.gtg
+dir hmwqgjnl
+dir pfcjgrgp
+dir prhzdjqv
+132543 qlwqmd.wmj
+223249 rcm.psp
+124899 zvzjh.sbg
+$ cd hmwqgjnl
+$ ls
+99756 mvdpfcvs.wft
+$ cd ..
+$ cd pfcjgrgp
+$ ls
+dir lbbg
+dir nlgf
+130799 wtrdvzhs
+$ cd lbbg
+$ ls
+193125 lnjvpcgq.zqs
+dir vnlmr
+$ cd vnlmr
+$ ls
+39935 lgd.hzz
+$ cd ..
+$ cd ..
+$ cd nlgf
+$ ls
+106563 jfr
+$ cd ..
+$ cd ..
+$ cd prhzdjqv
+$ ls
+dir jhhq
+$ cd jhhq
+$ ls
+135155 mzjdptfm.fln
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rnrr
+$ ls
+249039 jczs.rgg
+154853 whlwl
+$ cd ..
+$ cd vzjh
+$ ls
+dir hjrs
+$ cd hjrs
+$ ls
+146991 mmhtpz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jvr
+$ ls
+13268 gwsldhjc.vbf
+dir hbpwd
+34369 mjtwr.rpv
+dir tfvztnb
+$ cd hbpwd
+$ ls
+253823 bzqc
+dir dscbfp
+237051 ggvvcpg.gmj
+23097 mhl
+211524 ndhvh.jbq
+133936 qzslmmz.fzp
+$ cd dscbfp
+$ ls
+184190 msfmjd.vlr
+238872 ndhvh.jbq
+dir pfsq
+dir pljsm
+dir tlgtcb
+$ cd pfsq
+$ ls
+dir hmwqgjnl
+249351 mmhtpz
+$ cd hmwqgjnl
+$ ls
+301132 rcm.psp
+$ cd ..
+$ cd ..
+$ cd pljsm
+$ ls
+263279 bqh.vhl
+$ cd ..
+$ cd tlgtcb
+$ ls
+50558 bgzrlnzz.rfm
+83169 gtrjzl.hhh
+212764 mgf.zlg
+210599 mmhtpz.dqm
+dir tqsvhc
+$ cd tqsvhc
+$ ls
+264513 lnjvpcgq.zqs
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd tfvztnb
+$ ls
+dir mdz
+$ cd mdz
+$ ls
+209155 dqjh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lcvdgm
+$ ls
+135165 lbbg.gsz
+282211 vlbwsps.plg
+$ cd ..
+$ cd mmhtpz
+$ ls
+dir dscbfp
+dir mmhtpz
+70564 msfmjd.vlr
+dir nzdvqb
+59232 rgvvz
+dir ztbht
+$ cd dscbfp
+$ ls
+dir cddzd
+dir dscbfp
+dir hmwqgjnl
+142689 qnnc
+dir whbjm
+$ cd cddzd
+$ ls
+255928 dtnn.hzf
+$ cd ..
+$ cd dscbfp
+$ ls
+dir brvf
+182587 fhmzbc.nlb
+129514 lbbg
+177841 ngw.tlj
+dir qttp
+dir zdmb
+269964 zqn.htj
+$ cd brvf
+$ ls
+24071 tzsvg.pwc
+174118 vtdntn
+$ cd ..
+$ cd qttp
+$ ls
+54613 ccdnjnwz
+131277 zzppc
+$ cd ..
+$ cd zdmb
+$ ls
+117682 bwjhr.gvw
+dir hmwqgjnl
+138816 jczs.rgg
+273129 mmhtpz
+89710 rcm.psp
+dir rgvvz
+$ cd hmwqgjnl
+$ ls
+102907 mmhtpz.dnp
+235885 ndhvh.jbq
+239856 rcm.psp
+$ cd ..
+$ cd rgvvz
+$ ls
+dir fpzzfc
+292842 lbbg
+70603 msfmjd.vlr
+157797 qjs.zlm
+dir zgn
+$ cd fpzzfc
+$ ls
+dir rgvvz
+$ cd rgvvz
+$ ls
+222407 crrwlp.zcd
+$ cd ..
+$ cd ..
+$ cd zgn
+$ ls
+70915 hmwqgjnl.zdg
+276918 lbbg.wlg
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd hmwqgjnl
+$ ls
+207726 cqn.rds
+$ cd ..
+$ cd whbjm
+$ ls
+44954 ndhvh.jbq
+136649 pphznj
+dir ptq
+215264 rmpbqgrl.mqt
+276795 tbtv
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+$ ls
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diff --git a/i8.txt b/i8.txt
new file mode 100644
index 0000000..3346920
--- /dev/null
+++ b/i8.txt
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diff --git a/i9.txt b/i9.txt
new file mode 100644
index 0000000..514b93e
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