There are a total of 96 puzzle pieces to acquire throughout Astro’s Playroom, 64 are acquired throughout the 4 main worlds (16 in each), Cooling Springs, GPU Jungle, SSD Speedway and Memory Meadow
4 are acquired in CPU Plaza and the other 28 are acquired from PlayStation Labo
To acquire a puzzle piece, you will need to make your way through the level performing basic tasks for some such as pull a switch, traverse a wall, walk around a ledge then pick up the puzzle piece