BOXBOXBOY! (Hako Boy! Mouhito Hako in Japan) is the sequel to the 3DS eShop title by HAL Laboratory, BOXBOY!, released in 2016. The main new addition is the ability to have a second set of boxes.
The main addition is the second set of boxes separate from the first set Qbby puts out. If Qbby tries to put out a third, the original disappears. The first set is green while the second set is blue-green. The two sets of boxes enable new puzzles as well as new spins on old mechanics. For instance, Qbby may need to press a button to open a gate but use a separate set of blocks to get up a platform.
The player can dress up Qbby in a different costumes purchased from the ingame store that uses currency from beating the levels
Players of the original can import costumes from the original if they have save data with them.