Enix's 1983 release Door Door and Sega's 1985 release Doki Doki Penguin Land (for the SG-1000) are perhaps the first examples, though the genre is diverse, and classifications can vary.[4] Doki Doki Penguin Land allowed players to run and jump in typical platform fashion, but they could also destroy blocks, and were tasked with guiding an egg to the bottom of the level without letting it break.[4]