To get the cheat screen you press C-Up at the Select Event menu.

N0CR4SH	No crashes
H34DL3SS	Headless rider in practice mode
BL0CKM3	All riders block you
G14NTS	Giant riders
N00FFTR4CK	Cancel Off Track reset
B1GSPR4Y	Big dirt sprays
M0R3C4MS	Additional views
H0P	Extra hop button
SK1PP1NG0K	Cancel Skipping Track reset
B1GB1K3S	Big bikes
N0R1D3RS	No riders
M00N	Moon gravity
S4TVRN	Saturn gravity
V3NVS	Venus gravity
M4RS	Mars gravity
VR4NVS	Uranus gravity
N3PTVN3	Neptune gravity
M3RCVRY	Mercury gravity
JVP1T3R	Jupiter gravity
PLVT0	Pluto gravity