It seems that this is old news generally, but I found Mario Paint Composer on the Internet yesterday. It was actually due to a YouTube video (why the hell I ended up looking at a Rick Astley song I still don’t know).
Of course, there is not one but two composer programs emulating the features of Mario Paint. The other is Mario Sequencer, which was originally written in Japanese. Luckily the website hosts an English version.
I’ve found that sequencer seems to have better timing, but Composer has a slightly nicer interface.
I was musing on being able to use this in schools as a basic synthesizer for primary kids. It has everything they need, such as tempo and different sounds. Most importantly, the sounds are fun and absurd.
I’m currently working on my Mario Paint version of ‘Faithealer’…