A mark of finding something you truly love is that you feel like a fool for not having created it. Such is the case with “Spelunky,” a 2-D platformer in the manner of “Super Mario Bros.” that goes far beyond genre conventions.

Loosely based on the 1983 game “Spelunker,” “Spelunky” casts you as a squat Indiana Jones lookalike exploring a series of caverns. The underground setting is rendered in delightful subterranean cross-sections that will warm the hearts of anyone who remembers “Master Blaster,” 2004’s 8-bit throwback “Cave Story,” or that one “Where’s Waldo?” spread that sees him journeying through a network of dragon-jammed caverns.

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