Don't let the first board fool you - THIS LEVEL AINT CUTE AT ALL! The hardest and final level, the castle corridors are filled with ghosts and guillotines, arrow-firing Battle Bird soldiers and treacherous traps. Watch your step on the narrow walkways -- there are drops on either side, and it's a long way down....
When you get to Act 4-2 THIS IS THE ORDER YOU NEED TO GO IN: You should come upon 2 doors. Go to the first door on the right and get the key. Leave and go to the door on the left and get the Power Sneakers. You'll entire an entirely new room when you leave. Hit the switch. Run until the sneakers wear off, get the second key and fall into the warphole. Go into the first door you see, when you find the narrow ledge with the robotmen spin dash all the way across to save time. When you come to the second ledge, DO NOT SPINDSAH as the ledge curves. Instead walk along the left edge. Get the third key and you should come out near where you started. Go back and repeat ALL OF THE STEPS AGAIN up until you get to the switch part. Hit the switch AGAIN and and run along with the Power Sneakers - THIS TIME though - you will find the entrance to the warphole blocked and the goal now completely visible whereas it was not before. Its the ONLY way to pass this act. As for Act 4-3 DO NOT ASK ME HOW TO PLAY THAT ! YOU ARE ON YOUR OWN ! Its the ULTIMATE labyrinth maze and is VERY frustrating. Just keep moving so your time wont run out.
The boss of this board is the Egg-O-Matic War Blimp! Wait for the small Robotnik bombs to land and when the blimp shows up, let it drop the bomb. When it ducks down hit it! Repeat this 8 times. In its second form you will have destroyed everything but its head. Repeat the above process but this time he shoots lasers instead of dropping bombs. Destroy the head as it drops down, and when fully beaten you wil recieve the White Emerald and will have beaten the game!