How to play 2 player on same comp or online?
When you start Mari0, go to Options, and in there, press left to go to controls. For player 1, the controls should be fine. For player 2, you'll need a controller that has already been connected and detected by the operating system.
Once in the controls menu, go down to "PLAYER: 1" and press right to open configuration screen for player 2. Assign controls with enter on keyboard and then the button you wish to use. "Uses the mouse" should stay set as "No".
After you're done configuring, exit the options. Go to the "1 player game" in main menu and press right to add a player. Then, play.
As for playing over network, that'll be in SE, which doesn't have a release date.
Once in the controls menu, go down to "PLAYER: 1" and press right to open configuration screen for player 2. Assign controls with enter on keyboard and then the button you wish to use. "Uses the mouse" should stay set as "No".
After you're done configuring, exit the options. Go to the "1 player game" in main menu and press right to add a player. Then, play.
As for playing over network, that'll be in SE, which doesn't have a release date.