This is a simplified kind of inverse kinematics. The function finds an arm position that will reach a certain point. Simplified in the sense that this is done just using vector maths instead of an actual IK algorithm. You can look at this desmos graph if you want to see the maths more closely.
This is a work-in-progress game of picross. Has someone else used the name picocross? Probably, but this is my one!
It currently only has one puzzle and the game ends once you beat it.
How to play
Use arrows to move the cursor.
Press (X) to place a tile and (O) to place a cross. You can use the crosses to show where tiles definitely are not.