I have in past held some game based tokens but almost all of them are poor in performance. The gaming industry or the blockchain industry is still struggling to find the sweet and ideal way of integrating tokens, value and playing mechanics on a real game. Most of the projects that started by issuing ICO for a game are disaster, they were just moneygrab and never made an enjoyable game. The play to earn mechanics did bring traffic to newer games but when the reward started decreasing, they jumped into a newer. i.e. they were not able to retain users and their interest on such games. Now I don't hold the fully gaming based coins on a large amount.