Featuring a fresh set of vivid, newly themed worlds, The Rainbow Realms is a complete 8 world game, with level design aimed to emulate the style and creativity of the original Super Mario Bros 3. The difficulty curve is aimed at the average to good player of Super Mario Bros 3, though there are some challenging levels and a couple of difficult puzzles in the last few worlds.
Good luck, and enjoy the exploration of this colourful collection of levels!