How to play Infill
There are no ready-made blocks – you draw each one. Drag your finger across empty cells above the stack and let go: the block drops straight down as one rigid piece.
The squares at the top show how many cells this block has (3–6), and the next number is shown in advance. The drawing must have exactly that many cells. While your finger is down you can reshape it freely: the block is always the last cells your finger passed over, so go back, branch out (T and cross shapes work) or redraw. A dashed outline shows where it will land. Drag off the board to cancel. Greyed cells under an overhang can’t be reached.
Full rows are erased. A block cannot slide under an overhang, so draw the negative of what is below. A block that leaves no new holes earns the Perfect infill bonus.
Every few seconds a new row of rubble pushes up from the bottom – the bar under the board shows when. It speeds up as you clear rows. The game ends when the stack reaches the dashed line at the top. Once per run you can watch a short video and the eraser wipes the 4 bottom rows.