Collectible Card Games (CCGs). I was big into Yugioh for a large part of my life (HAT format being my favorite) until pendulums came out and ruined everything. Unfortunately the only older format anybody plays is goats, which was before my time. Dueling Network got closed down shortly after, killing the community I interacted with. I've tried several other CCGs in an attempt to scratch the itch (Hearthstone, Shadowverse, etc.) but none of them have really done it for me. It's kind of a dream of mine to make a card game of my own that resembles Yugioh before everything got ruined for me. Unfortunately I have zero programming experience.