Nice action and indeed interoperability is important for blockchain in gaming. They were several examples that could be inspiring (historically order): - In 2016 already 2 cards/tokens of https://spellsofgenesis.com/ were playable in another game, http://www.mandelduck.com/sarutobi/ - In the same ecosystem (on Counterparty/Bitcoin), several games & collections of https://app.bookoforbs.com/ have common playable items: Spells of Genesis, Force of Will, Age of Rust, Mafia Wars, etc. even with other games like Augmentors, or in another blockchain like with Beyond the Void (on Ethereum) - Cryptokitties.co allowed kittyhats.co and then promoted the concept with https://www.cryptokitties.co/kittyverse - Alto made a challenge contest for its crypto-items usable in multiple games https://contest.alto.io/ - Enjin followed the trends with their “metaverse” initiative - etc. So the concept is old, but had nice feedback from players