Pixel Power

Honey Blaster
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A shooter where you play a bumblebee fighting insects.

Dot Fighters
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Old fashioned fighter with ridiculously charming graphics.

The Crypts of Despair
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A Rogue-style game with pixels replacing the usual ASCII.

Ratmaze 2
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You’re a rat, you’re in a maze, and you need to collect letters and cheese.

Narbacular Drop
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The game that gave us Portal: a student project based on puzzles and portable holes.

Elder Scrolls: Arena
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The incredibly early first-person RPG that gave rise to the Elder Scrolls series, Morrowind, and Oblivion.

Duty and Beyond 
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A point-and-click adventure about delivering pizza, with charming graphics and mercifully logical puzzles.

On A Rainy Day
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An elasticized tree of hands must help paper boats cross a river via judicious use of umbrellas. Yes, it’s like that.

Darwin Hill
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Juggle the principles of evolution as you populate a hillside of weird humanoids. Mate, kill, or watch the results of overpopulation.

The Virtual Contraption
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A physics-based platformer where every surface wobbles and waves when you put weight on it.

Super Energy Apocalypse
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Defend your trash-recycling center from zombie attack. Has both tutorial campaign and sandbox modes.

Tower of Goo UNLIMITED!
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The unlocked inspiration for World of Goo.

Freeciv
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The original Civilization, remade for free-software-loving hippies. Still fun.

FreeCol
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Colonization was Sid Meier’s American history strategy game. Read the manual before you start this one.

Ground Control
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A race of super-women, giant artillery trucks, and a twitch approach to real-time strategy; precursor to today’s World in Conflict.

Spring
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A freeware RTS that began by sprucing up Total Annihilation, but now exists as an indie alternative.

Cultivation
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A competitive commune simulation - grow enough food to feed your habitat.

Micropolis
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You can’t beat SimCity, so the open-source devs didn’t; they simply remade it and gave it a new name.

Railroad Tycoon
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The original classic: arrange deliveries of goods to build an industrial empire.

UFO: Alien Invasion
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Modern reinterpretation of the X-COM games, following their use of Geoscape and Tactical modes.

The Jeluvian Project
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A sci-fi turn-based strategy game. Ignore the graphics: there’s some deep, thoughtful skirmishing here.

Oasis
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A superb cross between Minesweeper and Civilization, with barbarian hordes.

Naked War
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Cute email strategy game for free trial. Quirky and very, very British.

GLCatan
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The classic Settlers of Catan board-game, rebuilt for the PC. Up to four players can join in, taking turns.

A Game for Three-Year-Olds
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Or 36-year-olds, as the case may be. Prod and combine scribbled objects just to see what happens.

Sprout
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Continually resprout as a new plant traveling across the world to achieve your dream of being an acorn.

Warbears
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A crack team of bears fight crime with puzzle-solving and timely maneuvers.

Gesundheit!
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Snot-eating monsters have invaded town; lure them into the mouths of underground fish.

Bound Plus
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You’re a ball trying to reach an exit, with different surfaces in the world helping or hindering your progress.

Fold
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Create spheres that alter local gravity to fling you where you need to go.
Physics!

Gravity Head
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A game in which your head is the source of all momentum.

Blight Warrior
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Mad fractal physics game based on “Diffusion Limited Aggregation.” May crash your PC. And your brain.

Phun
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Insanely clever and compulsive physics sandbox developed as part of someone’s Master’s thesis.

Below: You can make all kinds of stuff in Phun, like this water car


Baron von Puttyngton versus the Cancerous M.C. Escher Maze of Cheese
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Use the mouse wheel to spin the level, moving your block of cheese with the level’s flipping gravity.

Ichor
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Surround your opponent with ichor to win. A truly astonishing game based on fluid dynamics.

Extreme Violence

Tekkyuuman
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Astonishingly violent platform game from Japanese gaming savant Ikiki. Like an anti-Mario, you jump around and blast people into showers of meat.

Below: Watch Tekkyuuman blast enemies into showers of meat


Space Barnacle
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Meet interesting aliens and, well, meat them in this absurdly violent scrolling platformer.

Hammerfall
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Thrash around in the air fighting bugs and airships in a craft equipped with hammers, scythes, and other toys.