The listing, Lexica [Steam Link] has ended.
Great interactive tutorial to help you learn the ropes quickly and easily
12 puzzles per pack with 8 packs for each difficulty level!
3 levels of difficulty – easy, medium and hard – take you from novice to expert
A total of 288 rounds to play throughout!
Measure your progress with live stats and ratings
Run in small window mode for a quick challenge while using other applications
Complete all 13 Steam achievements to prove your skills to friends!
More info: http://store.steampowered.com/app/306680/
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Good Luck!