#25 League of Legends
This DOTA-inspired game is one of the most popular online multiplayer games the internet has to offer. It may not be entirely possible to thrive on League of Legends by sticking to the free mode, but that shouldn’t stop you from playing the game and—if you don’t like the idea of spending time to unlock champions—pay to unlock the ones you’d like to play.
Passage is the definition of “games as art.” The game manages to elicit more emotion through its 8-bit graphics than most triple A titles. It’s the best 5 minutes you’ll ever spend playing a game.
#23 Dwarf Fortress
Dwarf Fortress is the only game on this list to favor a text user interface over graphics. It’s critically regarded as being one of the most intensive economic and strategic simulations to ever exist. Fortunately for players who can’t get used to the game’s text interface, there are a number of graphical mods that make it not only accessible, but even more enjoyable to play.
#22 Battle for Wesnoth
Battle for Wesnoth is a free downloadable turn-based game in the same vein as classics like Panzer General and Fantasy General, where battles take place on a hex map. Loosely based on the Sega Genesis title Warsong, Wesnoth is an open source strategy game with very simple rules yet remains both challenging and fun thanks to its strong AI.
Simutrans is an open source remake of Transport Tycoon, where the player strives to run a successful transport system by setting up railroads, travel routes and mass transit.