Hint: In places where you have to blast blocks with bob-ombs (e.g. in world 7-5 or 4-5) use a mega mushroom instead!
Hint: To get 99 lives, play World 1-1 or 2-4. in world 1-1, hit the 3 blocks before the staircase to get the red koopa to hide in its shell. Pick up the koopa shell. You must be super or fire mario (if fire, try not to fireball the shell. Now still holding the shell, stand on a step and, while facing the staicase, walk as far into the step a possible, and wait for the koopa to come out of its shell. When it does, you will lose 1 power-up. Now, Wit for the koopa to be at its farthest left point on the stairs (this is why you n eed the red koopa and it is much harder to use the slightly farther away green koopa), and jump on it. You will automatically hit the shell over and over, eventually getting 1-up s. You cannot have more than 99 lives under any circumstances, so you will eventuallly have the lives count stop at 99. In World 2-4, stand on a step and hit the green koopa tha\ is walking down the steps when it is at a comparable position to the one that the red koopa is in if this was in World 1-1
Ice is slippery! Be careful when running on ice.