Adding to what Blue Blood described, Sonic Simulator is also what I'd describe as yet another not-very-good attempt at adding cooperative multiplayer to Sonic gameplay. The level design and player speed don't really feel designed for an experience for two players (former is too large, and the latter is too fast); so the issue of players being easily left behind (and losing a life as a result) is still present. This is exacerbated by the odd "footstool" mechanic that knocks people downwards and stuns them everytime players interfere with each other during jumps/HAs. (It's kinda like what happens when people jump on top of each other in the NSMB games, but somehow more obnoxious.) The one thing I will give it is (unlike most Sonic games with co-op) the camera does pan in and out accommodate both players on screen, and there is a menu beforehand that allows you to alter the players' speed, but that's about it otherwise. It's an odd thing in that where with most of the levels being 2D and being more precision focused for platforming, you would think it would be more palatable for co-op than other attempts due to the slower-paced focus. But trying to play the Sonic Simulator with two players just accentuates the clunky gameplay going on there more than anything else. You're better off either doing the mode in single player entirely, or using the 1.5 mode, which is pretty much the "Tails' co-op" in the Genesis games--a second player can step in to assist every now and then and whatever deaths they have is negligible to the broader performance/progression (since in 2P mode, both players have their own lives and ring system). All I can envision from Sonic Simulation getting online multiplayer support is the netcode (assuming it's not programmed very well) amplifying those problems even moreso. Input lag and/or spotty connections on top of everything I've already described?...can't even imagine the outcome. But hey--despite all of Sonic Simulator's problems, I do like the chiptune music remixes made for the mode! The Planet Wisp and Terminal Velocity covers are my favorites.