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Climb an endless tower of 3x3 boxes. Three are active at once, stacked as one sudoku column - solve the bottom one to climb higher.
Dimmed boxes are "helpers" - read-only neighbors that give you extra row clues but can't be edited themselves.
Goal — solve position 1 and everything shifts up one slot. Get position 2 and/or 3 solved early and clearing position 1 shifts all of them up at once, for extra height in one move.
Lives — you have 3. Lose one for a wrong digit, or for running out of time on the current square.
The timer — the tube beside the board drains as your time for the current square runs out. It shortens as you climb higher, down to a 15-second floor.
Bonus time — clear 2 boxes in one move for +5 seconds, or all 3 for +10 - added on top of your timer for good, until the next scheduled drop.