61		123 Free Memory Card Games (Windows, 2003)
50		Absolute Memory (Windows, 2001)
45		Constellations (Windows, 2007)
45		Pat Sajak's Lucky Letters Deluxe (Windows, 2007)
43		Uli Stein: Color Chaos (Windows, 2005)
41		Hardwood Solitaire III (Windows, 2003)
40		Mahjong (Windows, 2017)
40		Cranga!: Harbor Frenzy (Windows, 2016)
40		Tokaido (Windows, 2017)
40		Boxed In (Windows, 2017)
40		Pixel Puzzles 2: Christmas (Windows, 2018)
40		Cabins: Jigsaw Puzzles (Windows, 2018)
40		Awkward (Windows, 2018)
40		Mnemonic (DOS, 1988)
40		Frutakia 2 (Windows, 2016)
40		Mahjong Halloween (Windows, 2013)
40		Mahjong (Windows, 2013)
40		Mahjong Christmas (Windows, 2013)
40		Mahjong Easter (Windows, 2013)
40		Mahjong Kitten (Windows, 2013)
40		Robin's Island Adventure (Windows, 2012)
40		Kremlin Puzzle 3D (Windows, 2002)
40		Constricting Cubes (Windows, 2016)

Notes: Games similar to Concentration, Games like Concentration, Freeze Tag, Inc., Freeze Tag, Inc., Windows, Puzzle, Board Game, Cards, Tiles, Game Show, Trivia, Quiz, Mental training, Tile Matching Puzzle, 1st-person, PC, Game Similarities.