0.5 allowed for switching between four worlds (Nimbus Isle, Nimbus Station, Crux Prime, and Gnarled Forest) by selection of different character. The only character that is playable is CheekyMonkey, as it was in 0.4. The hardcoded packets can be edited (specifically world\char_aw2.bin) to change the world's hex ID and checksum to load any world after pwjones released all known checksums.