Less a game than an interactive demo for R.O.B., Stack-Up feels rushed out the door moreso than any other NES launch title.
Japanese title: ロボットブロック • Robot Block
Note: The images below feature elements of the Japanese version: Red R.O.B. claw attachments (dark grey in the U.S.) and cream-colored platforms (light grey in the U.S.). The peripherals are otherwise identical between regions.