Quick solution
Board 1
Left, Right, Left, Left, Right, Up, Right
Board 2
Right, Up, Right, Down
Board 3
Right, Left, A, A
Board 4
Right, Right, Up, Up, Left, Right, Left, Left, Up, Left, Right, Left
Board 5
Left, Up, Left, Right
Then, lose a life and crash to get to the next board.
Board 6
A, Right, Right, Left, Left, Left, Up, A, Left, Left, Left, Right, Left, Right, Right, Left
Board 7
Right, Left, Right, Right, Right, Left, Right, Up, Right, Left, Left, Right, Left
Board 8
Left, Right, Left, Left, Right, Right, Right, Left, Right, Up, Left, Left, Right, Up
Board 9
A, B, A
Back to Sega CD