Blockland takes all the childhood fun of creating worlds and characters out of Lego blocks and takes it to the next level, allowing you to essentially create your own games and play in your own worlds. With a simple, intuitive interface and a completely open world (you can build a car, then race it. You can build a house and have little Lego people shootouts. Anything goes!), Blockland is serious, sandbox-y fun.

6. The Blob 

Kind of like Mario Paint meets Katamari Damacry, the Blob has the player playing as a colorful rolling blob spreading color throughout the world. As you roll over various NPC’s, your blob becomes bigger and changes color, adding to the veritable rainbow of craziness with which to paint the town. It’s a polished and addicting title, despite its humble roots as a student project.

5. Star Control 2 

Already one of the greatest adventure games of all time, Star Control 2’s excellent blend of resource management and intergalactic adventure has been available for free for some time now. The title is an absolute classic, featuring hundreds of hours of intergalactic adventuring, with tons of alien species to interact with, planets to land and mine for resources, and an excellent storyline. 

4. Echoes 

It’s a bit asteroids, a bit geometry wars, and very neon. The mechanics are similar to the seminal space shooters, involving shooting a whole mess of vaguely space-y objects in a colorful 2d plane. It also has one of the coolest and most honest game descriptions ever on it’s main page : “Echoes is essentially our take on Asteroids & to save anyone else the trouble of making the comparison, yes, it's also "a bit like Geometry Wars" :) Yeah, it's a bit like Asteroids hyperactive, drug crazed brother displayed in blur-o-vision and viewed through psychedelic sunglasses in a cheap nightclub.”