Additional mini subgames and secret areas

[lschmid83]

An idea commonly seen in 2D games is the inclusion of mini subgames which are completely different to the main game which provide variety and prevent the player getting bored. For example a top down driving game or something similar to the Breakout, Pac Man or Space Invader games. I have already implemented warp pipes which can be used to access underground secret areas and vines to climb to higher up areas it would great to expand on these ideas.