OpenEmu (formerly called OpenNestopia) is a free and open-source multiple systems universal game console emulator only for Mac OS. Its appearance means that the 'It just works' concept has extended to the video game simulation field on Mac operating system for the first time ever. And its purpose is to bring macOS game emulation into the realm of first class citizenship.

Castlevania Legends (AKA: 悪魔城ドラキュラ 漆黒たる前奏曲, Akumajō Dracula: Dark Night Prelude, Demon Castle Dracula: Dark Night Prelude) is the 3rd and final Castlevania series work released by KONAMI for the Game Boy handheld game console in Japan and North America in 1997 and 1998.

Castlevania II: Belmont's Revenge (AKA: ドラキュラ伝説 II, Dracula Densetsu II, The Legend of Dracula II) is the second Castlevania work released for Game Boy by Japan's KONAMI in 1991 (as a sequel of the first work Castlevania: The Adventure).

VisualBoyAdvance (VBA for short) is the number one, the most successful and most popular handheld emulator in the history of Game Boy Advance emulation. It is also one of the best video game emulators, and it's completely free and open source.