Chess Daily answer check — legally validates a complete UCI principal line against the pinned daily puzzle.

Chess Daily tactics puzzle — solve a deterministic UTC daily position from a pinned CC0 Lichess subset using legal UCI moves.

Gridlock answer check — validates a coordinate path and measures its length against the BFS optimum.

Gridlock daily maze — find an optimal orthogonal route through a deterministic bounded obstacle grid.

Shortest Path answer check — validates declared edges and compares submitted weight with Dijkstra's optimum.

Shortest Path daily graph — find the unique minimum-weight route in a deterministic directed or undirected graph.

Trivia Daily answer check — validates one opaque choice ID and explains correct answers from the curated record.

Trivia Daily knowledge challenge — answer one deterministically selected and shuffled question from a curated local set.

Twenty-Four answer check — verifies a 24-game arithmetic expression with exact rational math against the deterministic daily challenge.

Twenty-Four daily math puzzle — four numbers to combine into exactly 24; deterministic solvable UTC daily challenge for agent reasoning benchmarks.