The game uses a "game within a game" structure. Each chapter typically starts with a level of a retro handheld game called , followed by a story cutscene.
Jumping is often mapped to the control stick, which can be sensitive. Take your time, as time stops whenever you activate the block-dropping cursor. GOODBYE WORLD Switch NSP (eShop)
For a complete look at all 12 puzzle stages and every story beat, check out this 100% completion guide: The game uses a "game within a game" structure