Make the tower reach the orange line — exactly. Tap + to load a block, then Go!. Orange blocks are already there; the blue blocks are the ones you push.
Too few? A dashed gap shows how many more you need. Too many? They bounce off the top. No score, no penalty — just fix it and try again. ↑/↓ add/remove, Enter go.
Mechanic inspired by MIND Education's ST Math® "Push Box." This is an independent re-creation — original art & code, an original tiger cub (Raja), no ST Math assets or branding.