| Day | Title | Code | Tests | Visual | Tags |
|---|---|---|---|---|---|
| Day 1 | No Time for a Taxicab | code | tests | grid; manhattan | |
| Day 2 | Bathroom Security | code | tests | grid; up, down, right, left; dial | |
| Day 3 | Squares With Three Sides | code | tests | validate triangles | |
| Day 4 | Security Through Obscurity | code | tests | regex; char count; caesar cypher | |
| Day 5 | How About a Nice Game of Chess? | code | tests | password; hash; hex | |
| Day 6 | Signals and Noise | code | tests | string; read by column; most common chars | |
| Day 7 | Internet Protocol Version 7 | code | tests | regex; ip validation | |
| Day 8 | Two-Factor Authentication | code | tests | matrix; rotate arrays | |
| Day 9 | Explosives in Cyberspace | code | tests | decompress strings | |
| Day 10 | Balance Bots | code | tests | robots; low & high values | |
| Day 11 | Radioisotope Thermoelectric Generators | code | tests | missionaries & cannibals | |
| Day 12 | Leonardo's Monorail | code | tests | assembunny code; instructions; registers | |
| Day 13 | A Maze of Twisty Little Cubicles | code | tests | maze; manhattan distance; flooding | |
| Day 14 | One-Time Pad | code | tests | regex validation; md5 hash; hex | |
| Day 15 | Timing is Everything | code | tests | rotating discs | |
| Day 16 | Dragon Checksum | code | tests | binary strings; checksums; tail recursion | |
| Day 17 | Two Steps Forward | code | tests | maze; md5; exploration | |
| Day 18 | Like a Rogue | code | tests | game of life; traps | |
| Day 19 | An Elephant Named Joseph | code | tests | Josephus problem; Gaplist; thieving elves | |
| Day 20 | Firewall Rules | code | tests | number ranges | |
| Day 21 | Scrambled Letters and Hash | code | tests | swap; rotate; reverse; indices; letters | |
| Day 22 | Grid Computing | code | tests | disk nodes; manhattan distance | |
| Day 23 | Safe Cracking | code | tests | assembunny code; registers; copy, jump | |
| Day 24 | Air Duct Spelunking | code | tests | graph, distances | 2d coord; traveler |
| Day 25 | Clock Signal | code | tests | assembunny |
