SpellTower

In the iPad puzzle video game SpellTower, the player attempts to clear the screen of jumbled, lettered tiles by using them to create words. The player can select adjacent and diagonal tiles to create words, which clears those tiles from the screen. If the player creates a long word with five or more tiles, any adjacent tile will be cleared as well. Additionally, difficult characters like X, Q, and J, will remove an entire row when used in a word. Some tiles are blank and can only be cleared by such an adjacent effect.

There are several game modes. In Tower mode, the player has 150 set tiles and tries to remove as many words as possible before running out of options. In Puzzle mode, for each set of tiles removed from the board, another row is added to the screen. The game ends when the tiles fill the screen.

When indie developer Zach Gage was first told about a video game that combined Tetris and Boggle, he had a very specific idea of how the game would play. But after seeing that the prototype of Puzzlejuice played differently, he created—with Asher Vollmer's permission—the version he imagined as SpellTower. Gage's game eventually released prior to the game that inspired it.

SpellTower was released for the iPad tablet computer on November 17, 2011. A month later, Gage added support for iPhone and iPod Touch, and Game Center achievements. In 2012, Gage added local multiplayer support over Bluetooth in a new battle game mode. Gage later released versions for OS X (July 25, 2012) and Android (March 7, 2013).

The game received "generally favorable" reviews, according to the video game review aggregator website Metacritic. Edge called it a "magnificent ... brainteaser that's nervy, humbling, and strangely energizing". The title was one of TouchArcade's honorable mentions for 2011 game of the year.

A year later, TouchArcade said the game remained among the best on the App Store. In 2012, SpellTower was named among IGN's underrated iOS word games.