Press Enter, then type "~makemyday" and press Enter again. Now, type one of the following codes (also you should replace ~ with Period when playing the game in RPG mode):
500,000 of all resources: ~baegopa
All buildings destroyed: ~hastalavista
Fast construction: ~simsimhae
Fast mana regeneration: ~knowledgeispower
Full health: ~godblessu
Full mana: ~amosbemerciful
Full map: ~dayspring