A bit boring because it takes you back to the start of each level when you fall off, so you have to do the same half a level like a billion times and yeah...
The perfect circle is: 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
8214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196
4428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273
724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609
450 450 450 makes a square. 900 900 900 makes a line. - it is obvious it goes by angles, and times' these angles by two. A squares angles are 90 90 90 90, and a line is 180 180