https://zappatic.net/ Personal blog of Kasper Nauwelaerts / Zappatic en-us Tue, 09 Sep 2026 17:27:00 GMT Tue, 09 Sep 2026 17:27:00 GMT https://zappatic.net/blog/2026/09/easier-grand-theft-auto-cheats Do you remember all the cheat codes in the Grand Theft Auto trilogy by heart? I don't! Let's investigate how they work inside the game, and remap them to our custom cheat codes. Tue, 09 Sep 2026 17:27:00 GMT https://zappatic.net/blog/2026/09/easier-grand-theft-auto-cheats https://zappatic.net/blog/2026/08/keen6-savegame-editor In this blog post we take a look at reverse engineering Commander Keen 6 and its savegame file format, to see how we can make a savegame editor. Fri, 07 Aug 2026 16:05:00 GMT https://zappatic.net/blog/2026/08/keen6-savegame-editor https://zappatic.net/blog/2026/03/willy-beamish-secret-debug-menu An addendum to the YouTube video where I figure out how to trigger the secret debug menu in The Adventures of Willy Beamish. Tue, 24 Mar 2026 18:00:00 GMT https://zappatic.net/blog/2026/03/willy-beamish-secret-debug-menu https://zappatic.net/blog/2025/01/marching-little-byte A weird section of memory caught my eye while reverse engineering Eggerland Mystery, a set of data in which a single byte seemingly marched on. So, I try to figure out what exactly this area of memory represents. Sat, 08 Feb 2025 18:00:00 GMT https://zappatic.net/blog/2025/01/marching-little-byte https://zappatic.net/blog/2025/01/how-are-levels-stored-in-eggerland-mystery Let's take a look at how level data is stored within the Eggerland Mystery ROM. There are two algorithms used for level storage, and we discover some remnants of some hard choices they had to make in 1985. Sun, 19 Jan 2025 12:00:00 GMT https://zappatic.net/blog/2025/01/how-are-levels-stored-in-eggerland-mystery