Castlevania Advance Collection is a compilation package of 4 classic Castlevania games, released for Nintendo Switch, PC (via Steam), PlayStation 4 and Xbox One platforms by KONAMI in 2021 (on its 50th Anniversary Celebration). As its name suggest, this is just a pure collection of games + some supportive features, nothing else to look forward to. For example: the graphics of games are not as good as many emulators do. In other words, it is more suitable for fans of Castlevania to collect, and won't surprise you much.

Castlevania, a horror action adventure game series created by the well-known game developer Koji Igarashi (いがらし こうじ, 五十嵐 孝司) from Japan, has been praised by numerous players around the world for its unique gameplay, diverse exploration and puzzle solving elements since it was first launched on the FC game console in 1986. So far, it already has a history of more than 30 years. In addition to games, it has also launched novels, comics, animations and other pan-entertainment multimedia. Therefore, its influence on future video games is self-evident.

Castlevania Double Pack has two previous great and complete Castlevania games on Game Boy Advance console in one game cartridge, they are: Castlevania: Harmony of Dissonance + Castlevania: Aria of Sorrow. It was licensed by Nintendo and released by KONAMI in 2006.

Contra: Evolution (AKA: ??? - ????) is an HD remake of the original classic video game Contra released on NES console in 1987. It was developed by Konami's Shanghai studio and originally published by CocoaChina for cellphone in 2010, then for arcade in 2011. Later, it was ported to Android, iPhone and iPad. And this one is for Windows.

Akumajou Dracula X: Gekka no Yasoukyoku is the Japanese version (only sold in Japan) of the Castlevania: Symphony of the Night (悪魔城ドラキュラＸ ～月下の夜想曲～) originally released on PlayStation (PSone, PSX) console. It was published as the direct sequel of Akumajou Dracula X: Rondo of Blood, for Sega Saturn platform.