Sarasaland Adventure v4.0 (SMBX) - Summit Castle (5-8)
Info: https://rpgmaker.net/games/4216/
5-8 is a pretty dangerous level overall. Probably not as dangerous as 4-8 is, but there are still sections of this level that require extreme caution, such as the room with the rising lava. You'll need to be quick when getting those stars, too - the first one, especially. Those arrow platforms from 3-7 are also back for this level, too. Oh, and I died once due to me performing a really bad bounce off one of the note blocks.
Larry is a tricky fight. The goal is to land 3 bombs on him, but the bombs will spawn at one of three different pipes. Not only do you have to locate where the bomb is going to spawn, but it is difficult to dodge both Larry's fireballs and the pirahnas' fireballs, the next bomb spawns from a different pipe when it explodes - AND that platform is slippery. There is a pattern to how the bombs spawn though; just look at where the pirahna plants show up, and whichever pipe doesn't have a pirahna plant is the one that the bomb will spawn out of. You can also shoot Larry with electroballs, but it's really difficult to do so with all the projectiles coming at you.