Sum Triangle
All gamesHoles 0 / 8Tries left 4Chain 6 deepBoard deep
8 holes left, 4 tries left. Cursor on row 1, position 1, which nothing on the board forces yet. Holding 9. 3 of the open holes can be worked out right now.
Row 3, position 1 is marked "add": it is the two cells below it added together. 2 other holes are decided as well.
← → (or A D) step between open holes · ↑ ↓ (or W S) jump a row · F or Shift holds the next number in the tray, Esc or Z the previous one · Enter or Space puts the held number in. Or click a hole, then click a number. A number that does not belong is refused and costs one try; moving and choosing cost nothing. Click the board first, or press Tab to focus it.