
Fireboy and Watergirl: The Elements
One keyboard can run both characters: arrows for Fireboy, A and D plus jump for Watergirl. The catalog also says one person can switch between them.
These titles carry a two-player tag in the BasketballBros.me catalog. That tag means the game page describes local or shared play for two people. Open the game and confirm the mode it actually offers before you plan a session with a friend.
Basketball Bros is included because its menu has a "2 Players Same PC" option. Other cards are included from catalog tags, so confirm the mode inside each game.

One keyboard can run both characters: arrows for Fireboy, A and D plus jump for Watergirl. The catalog also says one person can switch between them.

The catalog tags Level Devil as two players. The control notes describe one runner. Confirm a second player inside the game before you treat it as a shared game.

The catalog lists separate keys for one player and for a second player on the same keyboard.

The catalog tags this as a two-player game, but the control notes describe one mouse for aiming. Open the game and confirm a second player before you plan a shared session.

The catalog gives both sides movement keys and different power-up keys, G for one side and L for the other.

The menu on the embedded build includes 2 Players Same PC, plus Online vs Friends with Host or Join.