Fishy Sudoku

Settings

Cursor type

Peer shading

Same-digit shading

Digit completion sashes

Conflict checking

Timer

Tap: Selects a square. Tapping away from the board deselects.
Double-tap: On a square down to a single candidate, enters that digit. On one with several, turns on candidate editing, so the digit pad toggles pencil marks instead. Double-tap again to leave.
Triple-tap: Carries on from the double-tap: fills in every square that is down to a single candidate, one at a time. Each digit entered can narrow a peer to one candidate, so the board is checked again after every placement and the run keeps going until no square has a lone candidate left.
Long-press: Turns candidate editing on, the same as a double-tap on a square with several candidates.
Keyboard: 1-9 enter a digit. Backspace, Delete, and 0 erase. Arrow keys or WASD move.

This will clear every digit and pencil mark you have entered, and restart the clock.

Your progress on the current puzzle will be lost.