A game that only came out on the master system and game gear. Mega drive/genesis never got a version of this and boy did they miss out. This game is easily one of the best on the Master System.
It's a 2D platforming game with light metroidvania elements in that you get power ups later in the game which you can use to travel back to previous levels and find secrets, and there is a LOT of secrets.
I got this for my 9th birthday I think? But me and my brother have absolutely played it to death.