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.

Warzone 2100 is a completely free and open-source RTS (real-time strategy) and RTT (real-time tactics) hybrid Red Alert like game for Windows, Mac and Linux platforms. It was developed by Pumpkin Studios (with C++) and published by Eidos Interactive in 1999.

When it comes to insanely difficult platformer games, many players in Asia will think of Cat Mario (Syobon Action) from Japan. In fact, in the same year, there was a game called I Wanna Be the Guy that was popular around the world. It is much more difficult than Cat Mario. Even if you have watched various walkthroughs, speedruns, and know the distribution of traps, the results will not help. Generally, you can't get past a level without trying hundreds of times.

If you like the once popular highly difficult climbing type of game Getting Over It with Bennett Foddy, then you probably already know about and want to try out the game that inspired it: Sexy hiking. Sexy Hiking is a physics-based small 2D platformer game, created by Jazzuo from Czech Republic in 2002, using GameMaker Studio game engine.

ScummVM (short for Script Creation Utility for Maniac Mansion Virtual Machine) is a free and open-source cross-platform interpreter (not a game emulator) for many classic point-and-click adventure and role-playing games that were made for DOS platform only, originally written by Ludvig Strigeus in 2001.