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any rectangle up to 64 cells (e.g. 4×12) — smaller levels count via wall padding
Pick a specific size above to filter by exit location.
Submit a level
Paste a Pathology level code (rows of tiles, one row per line; tiles 0-9 A-J, single exit, any rectangle up to 64 cells). Most levels are verified optimally; if one is beyond the solver, you'll be asked for your best solution and it is stored as an unverified claim. A level is accepted if no stored level matches or beats it in every way — including smaller levels padded with edge walls.
…or just give a shortest-solution length: