Anchor Builder is a trad climbing anchor-building simulator I built as a training tool. Procedurally generated crack systems run down a granite face; against a draining pump clock you pick gear off a real Black Diamond rack, position it over the crack, and place three pieces. To seat a cam you retract its lobes to fit — on desktop hold SPACE, on a phone rest your thumb below the cam and pull two fingers down toward it — just like pulling the trigger on the real thing. A fall test then decides whether your anchor holds. It plays best fullscreen (on a phone, in landscape), but you can play it right here too.
Or just play below — rotate your phone to landscape. Fullscreen is roomier, but optional.