Well, all bricks besides the "orange/brown" ones are possible to tear down. The coloured ones needs one hit, the grey ones needs 2-5 hits I think (Depending of what round)(posted 8560 days ago)If you are talking about Arkanoid 1, there are no stage that is not possible to pass through. look for a grey or coloured brick and try to tear that down and proceed in that way.
Regards
QRS