Table 1.

Equations used in each stage to set the game environment.

Stage	Input	Distance	Speed	Time
1	X0a, Ib	X0+(IXsc)	Constant	Constant
2	X0, DVd	X0+Random (–DV, DV)	Constant	Constant
3	X0, Sp0e, Ispf	X0	Sp0+(IspSX)	Constant
4	N/Ag	Random (–7.5,7.5)	Constant	Constant

^aX_0: starting distance.

^bI: incremental distance.

^cIX_S: incremental distance as function of score.

^dDV: distance variance.

^eSp_0: initial speed.

^fIs_p: incremental speed.

^gN/A: not applicable.