NFT stands for Non-fungible Token, which represents unique and non-interchangeable assets, based on blockchain technology. One of the applications where NFTs are being used is in gaming, by using NFTs as in-game assets. So far, the inclusion of NFTs in games has not led to new gameplay mechanics. Most developers opt to use the blockchain just as an asset repository ignoring other blockchain capabilities. To facilitate the development of games able to explore NFT-based game mechanics, we created NFLegacy, an NFT-based Game Ecosystem. Furthermore, we propose a game mechanic, inspired by object attachment theory, where a player shares item progression across different games. Using NFLegacy, we have developed and tested a prototype with three mini-games. To assess the improvement in the player experience, we conducted tests with a selected group of users and analyzed the results.