Zaku is a homebrew scrolling shooter video game developed by PenguiNet and published by Super Fighter Team exclusively for the Atari Lynx on 24 October 2009. Taking place on a futuristic setting where Captain Bran and his minions plan to oversaturate the worldwide market with poor quality software using the "Rarity 9" programming tool, players assume the role of the titular character in an effort to retrieve the stolen tool from Bran.

Zaku was conceived by Osman Celimli at a young age during his time working at PenguiNet, who wanted to create a project for a handheld game console, initially focusing on the Game Boy before shifting towards the Atari Lynx and was influenced by Air Zonk, lasting over a course of six years under development prior to release. The game was met with positive reception from reviewers since its initial release, with praise towards the presentation, audio, plot and gameplay, but criticism pointed to its length and some of its design aspects. As of 2018, the title has sold over 1,000 copies in total.