Play Sonic Flash
This game pits you against Dr. Eggman and his evil Mecha Sonic. It's up to you to help Sonic prevent the city from being destroyed. You'll begin the game by going through the menu and choosing Enter Mechanical Madness Zone. This will put you in a factory with several obstacles in front of you.
You can clear the spikes by using the up arrow key to jump. You'll then need to time your next move perfectly to avoid getting smashed.
Once you're in front of the elevator, press the down arrow key to go up. Proceed past the next two obstacles and then kill the bad guys by pressing C, X or Z. You'll then enable the switch by standing in front of it and pressing control on your keyboard. Then head back down the elevator and continue through the game.
Directions
Move: Left/Right
Jump: Up
Crouch: Down
Scissor Kick: Left Shift
Somersault Kick: Z
Spin Kick: X
Kick: C
Block: B