Inspired by Slay the Spire, combine marble ball with card deck-building. This game is for players who like to experience more luck and randomness but less strict strategy card game. Combo Ball Slayer is a roguelike card deck-buiding game. We really love the experience of building a unique and interesting card deck, and Slay The Spire has done a milestone demonstration. If you are a fan of Slay The Spire, Things you will be familiar with: 1. Starting with a basic card deck, and gather new cards from battle, shop and events. 2. Turn based battle with card draw. Energy based card play. 3. Roguelike random map generation. 4. Collecting relics to totally change your play style. Things that will be new to you: 1. Cards need to trigger 4 types of marble balls to deal damage or effects, instead of causing damage and effects directly. 2. Manage you marble ball pool, including deciding what types or balls to fill, and the type of balls also affect your card usage strategy in certain turns.