Timespinner is a well-made 2D Castlevaina-like and metroidvania-style action adventure indie game developed by Lunar Ray Games and published by Chucklefish. The game was inspired by classic '90s video games, such as Castlevania, Mega and Star Ocean.

Attack on Toys is a free one and will always be free FPS + TPS + RTS type of indie game, developed by by N7T-GAMES. It borrows primarily from four toy soldier type of games: Army Men, HYPERCHARGE: Unboxed, The Mean Greens - Plastic Warfare and Home Wars. We can think of it as a spiritual sequel to Army Men, or a toy soldier edition of Battlefield.

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.

DCS World (short for Digital Combat Simulator World) is a air combat simulation platform derived from Eagle Dynamics' Lock On: Modern Air Combat and The Fighter Collection's The Battle Simulator, developed by Eagle Dynamics from Russia in 2008. The developers' dream is to provide players with the most realistic simulations of military aircraft, tanks, ground vehicles, and ships.