Stats & Attributes
All three Character type has their own stats that can be upgraded - more in-depth in the enhancement section. Each Card Soldier type also has its unique upgradeable stats.
Experience points can be earned by playing the game. In the maze game, each step taken in the game equals some amount of XP earned.
In order to upgrade your NFTs, you would need to play the game and earn XP. XP levels limit the number of upgrades you can do. As you play the game, earn XP, and increase your level, you can upgrade more. More on this is in the Enhancement section.