I mean the jigsaw puzzle out on the patio. When you have a full inventory, each new item stacks onto the first inventory slot. Pic is an example of both. Also, max inventory will dead-end quickly, so I take that one back.

Some miscellaneous categories that I think would be fun could be:

Puzzle%- Completely finish the puzzle

Inventory%/Max Inventory- Exceed the inventory and hold nine items at once (objective could be eight instead), or hold the highest amount of items as possible (not time-based)

Stars%- Get all eight stars

Figures%- Get all four action figures