Setup First off, download the emulator pack here. Pass is "acesmother". File is "urzasmash.rar". Now we must make sure the correct plugins are selected. Run mupen64pp.exe Go to Options -> Settings (or hit Ctrl + S). The first screen you're presented with is for plugins. Make sure you have the same plugins selected as in the below screenshot. Next click the Directories tab. Click the Add buttons, and select the directory where Super Smash Bros. (U) [!] is located. After that, it should appear in Mupen's main window. Double click it to make sure it runs correctly. Don't try to play it, your controls aren't setup yet! Lets head back to Options -> Settings (Ctrl+S), and click Configure under the input plugin. I've found that this setup works best for the keyboard, but you can of course choose whatever keys you want (or use a gamepad). For those who haven't played the game (or are just rusty), the controls are like this: A - Normal attack B - Special attack Analogue - Movement and jumping C-Buttons - Can be used for jumping (I just use them to change character color) Z - Shield/dodge roll R - Grab/shield/dodge roll (slower for shielding than Z) L - Taunt/release Kirby power Start - Menu selection/pausing in-game Now that you have everything setup, spend a few minutes getting used to the controls before moving on to Connecting. Connecting Mupen64++ uses Kaillera servers for online play. Basically, the process consists of finding a server where all players have minimum ping, one of you hosting the game on that server, then everyone else connects. Open up the KailleraClient from Utilities -> KailleraClient (NetPlay). Enter a username (preferably your GBAtemp username so we know whos who), and make sure Connection type is ALWAYS set to "Good". The Recent tab is what you're going to use the most. All servers is an inefficient way to find the best server. We'll use the list located here. You can generally guess which will be best by choosing a server thats roughly located in between all the players. To connect to the a server, click Enter IP... and enter the ENTIRE address from the list. Any server you connect to will be added to the Recent tab in the KailleraClient, listed in order from last time you connected. Here find your name on the userlist to the right, and check how much ping you have. Two person matches should be fine as long as both people have under 120 ping, but you'll need much less for 3-4 people. One person must click Create new game and select Smash Bros [!] from the list. Everyone else must select his game from the Current Games list, and click Join. Once everyone has joined, the host just clicks start and you'll hopefully have a semi-lagfree (no offense lagman) game.