O
Omega - the final robot in the E-series, Omega was sealed by
Robotnik
in
Sonic Heroes
; its label is
E-123
Ω
Omochao - a mechanical toy
Chao
that provides information; first appeared in
Sonic Adventure 2
/
Sonic Adventure 2 Battle
One-up - an extra chance to beat the game; found by collecting 100
Ring
s or breaking a
video monitor
/
item box
with the player's picture on it
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