Undercards is a free multiplayer card game where the goal is to defeat your opponents by playing and collecting cards. You can collect and play with cards from all the different classes, but you can only use the cards from your hands.

The game is based on the idea that every player has a unique combination of attributes, known as "souls", that determine their strength and ability to perform certain maneuvers and strategies. Each class has a different combination of attributes, and players can only use the cards from their hands.

This means that the player with the strongest combination of attributes wins the game, but if the players are all using the same cards, the game will still be in the balance and the winner will be the one with the highest total.