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| Day | Title | Difficulty | Tags | Source |
|---|---|---|---|---|
| 1 | Historian Hysteria | 🟢 | sequence | day_01.ex |
| 2 | Red-Nosed Reports | 🟡 | sequence, validation | day_02.ex |
| 3 | Mull It Over | 🟢 | fsm, parsing | day_03.ex |
| 4 | Ceres Search | 🟡 | grid | day_04.ex |
| 5 | Print Queue | 🟢 | graph, sort, topological-sort | day_05.ex |
| 6 | Guard Gallivant | 🟠 | cycle-detection, grid, simulation, slow | day_06.ex |
| 7 | Bridge Repair | 🟡 | enumeration, recursion | day_07.ex |
| 8 | Resonant Collinearity | 🟡 | enumeration, geometry, grid | day_08.ex |
| 12 | Garden Groups | 🟠 | geometry, union-find | day_12.ex |
| 18 | RAM Run | 🟠 | binary-search, dijkstra, graph, grid | day_18.ex |
| 23 | LAN Party | 🟠 | bron-kerbosch, clique, graph, lan-party, maximum-clique | day_23.ex |