A while ago I started to become obsessed with calculating chess positions 'blindfolded'. Since there wasn't a training resource that I liked, I decided to start building my own.
This is the first trial version of my approach where I collected interesting puzzles and modified them for blindfold purposes. Also included is a trainer to practice square colours and a collection of master vs. amateur games to play though in the mind (more features are planned and in progress).
For extra fun I split the puzzles into easy and hard categories, with an end boss waiting at the end of each set. So if you play chess and are up for the challenge, be sure to check it out :)