A cool feature introduced in Sonic 2 is that if a vertical spring has bit 0 of its subtype set, characters bounce away from it in a 3D twirl...

In order to keep track of an object's animation across several frames, animation functions do a lot of extra bookkeeping within the obje...

Along with standardized functions for drawing and deleting sprites, Sonic 3 also includes functions that automate sprite animation. Most obj...

Alright, one final detail about breakable walls. Did you ever notice that the Knuckles walls from Carnival Night Zone end up reappearing muc...

Back in my first post about breakable walls, reader Telnaior was asking about Knuckles-only walls . There's actually no consistent way ...

This has absolutely nothing to do with breakable walls, I was just reminded of it when I was flipping between the Sonic 1 and Sonic 3 pictur...

When you crash through the rocky walls in Angel Island Zone and Lava Reef Zone, they break off into nicely separated rock sprites which then...

If you've picked anything up from my blogging style is that I like to first explain a topic in relative detail, and then follow it up wi...

The breakable wall object, like most other solid objects in the game, checks for collision with Sonic and pals by calling the SolidObjectFul...

The bit of code responsible for deciding whether or not a player should be able to destroy a breakable wall has quite a few peculiarities wh...