I’m currently part way through a big change that makes all the assets editable (to a greater or lesser extent) and rebuilds the ROM completely. Once that's done, saving will work for everything. I need to keep track of every item of art and where it's referenced from, and any constraints, to be able to repack them all without requiring any individual item has to be no larger than its original size. I've made a quick demo using this art by 'Aburtos':Īs a side note, this was actually a load of work as I had to rework my handling of art throughout to support alternative 'windings' of tiles into blocks: sprites sets are based on 8x16 with 16 per row, but Sonic is 24x32 in a funny order, and some are 16x16 in a non-sprite order. Also (to be a bit frustrating) only some of them are currently saved to the output ROM. Many of these share tiles and palettes, so take care. On here you can see various sprites and screens which are not tied to individual levels. The 'rings' and 'screens' tabs have merged to become an 'Other art' tab: You are likely to find you are over 100% of your floor budget at times as you duplicate data, but it should end up smaller overall once you are done. This splitting also allows a bit more optimisation of the floor sizes. The most useful thing you can achieve with this, in concert with the size editor, is to remove (or change) this sharing to make editing easier. Many of the game's floors cover multiple levels, and this lets you manage that. It's important to also manage the boundaries because you can end up seeing bits of rogue data sometimes. The Sonic 1 engine only supports widths of 256, 128, 64, 32 and 16 blocks, so you have to make suitable edits affecting the width. You can also 'move' data within a floor, for example -1 left and +1 right will move all the data left by 1 block while maintaining the level size. The most obvious thing to do is to resize them smaller to cut out unused data, to make more space for other things. You can edit floors, and also manipulate their objects, using this. I added another new thing for managing floor data, so let's show some (relatively boring) screenshots.

Sonic the hedgehog 1 bin rom