Cross Universe is a two player deck-building card game.
In the game, both players compete with a deck constructed beforehand and have 1000 life points each. The goal of the game is to reduce the opponent's life points to 0 through the abilities of one's cards or combat between the cards.
Decks can be constructed from the over 500 available cards, which are divided into spells, items and units. One unit card from the deck is chosen to be the player's 'partner card' at the start of the game and always remains in play. This gives more consistent access to that card's abilities than the rest of the deck which which gets shuffled and is then drawn from throughout play.