Draw a single loop that matches the numbers. (Mini Slitherlink.)
Use the numbers with + − × ÷ to hit today’s target. Tap-builder + on-screen keypad.
Draw edges so every line belongs to a completed square (any size) and match the numbers.
Classic cross-sums: fill digits so each run matches its clue sum with no repeats.
Reveal the hidden picture by filling cells to match row and column clues. (Picross.)
Classic minesweeper: reveal all safe cells. Right-click or long-press to flag.