Hey, these are some pretty good arrangements!... all of the... 2... songs I listened to... (I need to play more games). I listened to "Funky's Armoury (Duet)" from Donkey Kong 64, and "Multiplayer" from Bomberman 64. Those are some pretty good arrangements! Just a few things about "Multiplayer":
This is one of the super old ones that I need to get too, although those are some valid points of improvement that I probably would have missed.
- Is "Multiplayer" even the name of the song? I hear things like "Battle", or "Battle Arena". I figured it would be something like that. Feel free to correct me if I'm wrong.
- I'm not sure what you mean by "simplified", the song seems pretty accurate!
A quick search shows a trend for battle mode, so I will have to change that.
I will probably remove the "simplified" part, but it mostly has to do with the right hand before the breakdown. Instead of playing the octave chord and then just the top note of the octave, you would have to move the entire hand up and play the same chord an octave higher. This would be pretty tough at the tempo that the song is played, so my original decision was to cut the top from every second chord. Although, it is a pretty subtle difference that might require some good headphones to hear in the song

- The notes in the right hand during Bars 17-23 go too far down, making them hard to read. I think a clef change could fix this. Another way of fixing this is by putting the notes into the left hand and stating that the higher notes are played in the right hand.
I will definitely fix that. This was before I realized that I am a programmer and can go digging through the XML to make those changes

, although there is a tempo marking so... maybe it was just ignorance!
at a glance, the song also seems to have a consistent which I should take advantage of.
Regardless, those are some solid arrangements! I hope to see more!
Thanks for the feedback.

Also, you can use dashes for lists? I have been using the HTML style code this whole time which is a real hassle.