I never got to finish it, but I played it for a while when I was a kid and I can still hear the opening song whenever I hear the name. Plus the op animation blew my mind back then. Had no idea mobile games could have that much effort put into them. It seemed really not special at first (just match 3 card of the same color to attack the enemy) but the gameplay was actually fun. The digimon could be red, green, yellow, blue, black/purple, white and probably other colors too. When you'd match 3 red cards, the red digimon would attack. The colors also had a rock paper scissors system. It was pretty neat. Never got to finish it though.