Solve a force body diagram with climbing holds based on where you place your center of gravity, the arm holds, and foot holds. You can rotate and place holds, and do a whole lot more in this simulation.
Click on a hold to select it. Left click + hold to move a hold around. Right click + drag to rotate a hold. Scroll mousewheel to resize a hold.
A - spawn in hold
S - remove hold
Q - set selected hold to hand hold
W - set selected hold to foot hold