Remix and add something if you want, but you need to increase the remix level by one. Not intended to be considered spam, each project is different. Rules: 1. Add yourself. 2. Do not clutter the project too much. Make sure to delete some sprites if it's getting very cluttered. (This also reduces the memory, too.) 3. You must remix less than 5 times a day, otherwise the Scratch team will think the chain is spam.
Credits to all.
