There are other puzzle games that use portals, but
Epsilon is the most addicting and engaging free flash portal based game I've encountered. The graphics, music and sound effects are great and add to fun of solving the puzzles.
Epsilon is a little more complex than I typically like, but the other great features make up for that and in this case the complexity even adds to the fun of the game. The tutorial and text hints help you master the complexities of the game quickly. Get ready for some mind bending fun with Epsilon.
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