Finding Ronaldo:
Ronaldo can be found in the game as G. Silva on the Inter Milan team.

Winter Intro:
Type "win", several times while the game loads.

Classic Matches:
Type "the oldies" at the opening screen.

Secret Moves

Press these keys while playing the game:
Alt+A - Rainbow kick
Alt+S - Drag the ball
Alt+D - Spin
Alt+Q - Fake a trip
Alt+E - Double step-over
W     - Sprint