Knotilus

Sums MATH

Sums is a daily number-placement puzzle where the arithmetic is simple, but the spatial reasoning is the challenge. Hand-crafted puzzles, a daily leaderboard, and hints if you get stuck.

NumbersGrid MATH

Tap a square, enter a positive number that fits both the column and row conditions, and prove it. Every square needs a different number - reusing one gets rejected.

Rotato MATH

A daily logic puzzle: order a scrambled number grid by tapping the center of any 2x2 block to rotate it (clockwise or counter-clockwise) until the whole grid is in order.

Sudoku MATH

Classic daily 9x9 Sudoku with four fresh difficulties every day, a notes mode, instant conflict highlighting, and per-difficulty timing.

Ledger Lock MATH

Ledger Lock is a daily number-logic puzzle. Toggle cells on the grid so every row and column adds up to its target sum — but no two selected cells can be adjacent. One unique solution each day, with streak tracking and shareable results.