I don't know how old the game is but it's likely from the 90s-2000s. The graphics are 2d and the game is from a bird's eye point of view and iirc (I didn't finish the game, found it quite boring at the time) there was only like, one level format which was walking around over a single coloured background (pretty sure it was blue). I don't remember what you actually did in the game (aside from the fact that the gameplay was quite repetitive) but I think you played as some kind of ogre or troll.I also think that there were treasure chests but I might just be mixing stuff up.
The cover art (it looked the same for all the three games except that the colour was different) was just a monocoloured background and I think an image of the main character. The title of the game was something simplistic, like 'troll'.
I think the game was a trilogy and the background colour corresponded to the game, I had EITHER the blue, green/brown, and red one OR the bronze, silver, and gold one (I don't really remember the system). The games were practically the same, as I don't remember any significant differences. Does anybody remember this game?