The core gameplay concept remained the same throughout the title's development, however, changes were made to length of levels and the structure of the game.

Each set of stages was designed with a specific theme in mind with the intention of expanding the game's depth by introducing new elements continuously.

The game was released via the Nintendo eShop distribution service in Japan in January 2015, and worldwide in April 2015.

Some critics were pleasantly surprised by the amount of content that was offered and agreed that the package was good value for money.

is a puzzle platform video game in which players control a square-shaped character named Qbby.

[1] The goal of the game is to guide Qbby through a series of obstacle-filled stages that are divided into sets called worlds.

[3] The central gameplay mechanic is Qbby's ability to create boxes and make use of them to clear the obstacles.

[2] The boxes can be used to overcome obstacles, such as creating a bridge to pass bottomless pits or building staircases to reach higher platforms.

[1][2] The game features a minimal story, in which Qbby meets two additional characters, Qucy and Qudy, after progressing through certain worlds.

Prior to BoxBoy!, Mukae had never designed or directed a game, but his interest in undertaking these roles prompted him to start planning a project.

[8] Mukae's product proposal wasn't formally submitted to HAL until 2013,[3] when the company announced that it would field game design concepts featuring new characters.

[3] Initially, the development team were creating large stages that would take a fairly long time to complete.

However, they later decided that players should be able to complete them quicker, and thus the level structure was changed and the amount of content per stage was reduced.

[8] Since Qbby had a simple design, the team focussed on making his animations expressive to ensure the character was engaging and had a personality.

[9] The game was released for the Nintendo 3DS handheld console via the eShop distribution service in Japan on January 14, 2015,[10] and worldwide on April 2, 2015.

However, he was satisfied with the more elaborate stages presented after progressing through the game, calling the puzzles "ingenious" and praising the intelligent use of the box-manipulation mechanic.

[1] Bob Mackey of USgamer mentioned that the friendly approach, short levels, and frequent checkpoints did not detract from the game's challenge; he said that by allowing players to quickly test different solutions without having to restart a stage, HAL had managed to remove the frustration typically found in similar block-based puzzle games.

[14] Christian Donlan of Eurogamer was surprised by the long length of the game and the amount of variety it offered given its simple premise.

[4] VentureBeat writer Gavin Greene agreed that the game offered a lot of content at an inexpensive price.

's graphics and art resembled the style found in Game Boy titles;[2][6][7][13] the reaction towards it was mixed among reviewers.

The compilation also included a soundtrack CD featuring the music from all three games, as well as a Qbby Amiibo figure, the latter of which can be used with Bye-Bye BoxBoy!.