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The Criminal Girls games have various regional differences, namely the US version censoring more risque content. Colors and Shapes with Hickory has a few unused dialogue, but mostly the unaltered "Find the." (SND4) and "Make them." (SND5) recordings (the other two files have a silence gap but at a different file size and timestamp) stored as. Civilization IV and its expansion packs have a lot of unused graphics. There's a Sandbox page made by a user, but it requires some cleanup for a proper article. Child of Light has several unused textures, varying from crudely drawn stuff, developer notes and placeholder material. Cattails has a test map, unused text, and unused portraits that were called "sockpuppets" in development, as revealed in the game's discord. Card King: Dragon Wars has a debug menu that can be put back in with a mod. Build Away! - Idle City Builder has a debug menu. Brave Frontier has a debug menu (at least in the Android version).
Bionic Commando Rearmed 2 has some unused music.Ar nosurge has some unseen English translations of JP-only content.Agents of Mayhem has unused character intros.A Color Clown Comes to Town has some placeholder dialogue and alternate voice acting takes.Platinum Games tend to leave early/test content in their games.Hyperdimension Neptunia Re Birth3: V Generation.Many of Compile Heart's games may have leftovers from each other:.name, creator name, birthday etc) are unused. Miis that are built-in to Nintendo games often use the standard Mii format, but aren't exportable to the Mii editor, and sometimes some of their standard attributes (e.g.Games made with the SCUMM, AGI, and SCI engines tend to have easily accessible debug modes.
There are trainers out there specifically to enable these since they are usually disabled in the retail games.
A lot of Chrome Engine games have debug menus. Plenty of games re-released on Virtual Console have revisional differences. Capcom data was leaked in November 2020. 500GB of Ubisoft data was leaked in October 2020. The 2018-2020 Nintendo leaks contain interesting data that is not covered by existing pages.