Here's a quick and dirty full walkthrough.
From the start, walk to the edge of the platform so that it looks like he's about to fall off. Wait 30 seconds.
Now jump into the spikes until you die three times.
You can play this game in god mode without ruining achievements. DO NOT "add all items" or you won't get the achievements for actually getting those items.
Pause the game, then press
. Then go to Cheats and turn on god mode.
Once you jump a lot, you'll get this one:
Key 1 - Go left from start through the door. Go right through the next door. The key is on the far right.
Door 1 - Go left back through the door. Go through the next door on the left to the starting area. Go all the way right, and open the door.
Bomb - Go through door 1, then save at the statue.
Go through the far door on the right. Go left and down to the door. Go up and around this room to the bomb.
After the 5th time you blow up a wall, you'll get this:
Princess/Map - Go back through the door and all the way to the right. Climb up and left, and use a bomb to free the princess.
Spiked Shoes - Go back down to the left to the door in the center. Go all the way left (past the statue), through the door and into the starting area. Cross all the way to the left and through the door. Go left, use a bomb, and go through the door. Go left, scale the platforms, and get the shoes.
Now you can bounce off enemies. Once you bounce off 50, you'll get a shiny.
Key 2 - Retrace back through the starting area, past the statue and through the door just to the right of the statue. Bomb the floor to the right to get the treasure
. Now bounce over the bats to the left and through the door. Go left to the far door. Scale the platforms and go all the way to the right. Bounce off the green monster, and use a bomb on the wall. Scale the platforms, and drop down on the left to Key 2.
Door 2 - Leave this room through the way you came, bomb the door, through the left door, back to the right, all the way to the right, back across the bats, and the door. Left past the statue to the starting area. All the way to the left, then left again (through the wall), then right to Door 2.
Flashlight - Through the door, go right and scale the platforms to get the Flashlight.
Gloves - Retrace through the starting area (again), through the middle door by the statue, left across the bats, all the way to the left, and scale the platforms. Drop down to the right next to the statue, and use the door just next to the statue into the dark room. Cross the room all the way to the left, and into the room with lava. Scale the platforms, and go into the first room on the left. Go to the right, platform up to the top, and flip the switch. Slide down the left wall into the secret area (and the treasure
), then scale the left side to the gloves.
Key 3 - Retrace out of the room, and left over the wall. Go out the left door. As you go through the dark room, there is a hidden treasure
on a platform above the right door. Get it, then go through the door.
In this next room with platforms, don't jump down. Take the top platform all the way to the left, and jump through the upper left wall to get a hidden treasure
, then drop down to the lower left door.
In the next room, jump up to the platform in the center, just below the spikes. Jump through the ceiling just to the right of the spikes for another hidden treasure
. Go all the way through the door on the right, bounce across the bats to the door on the right, then to the door on the right. Left and down to the door. Left and across, bomb the wall and through the door into the dark room.
Go right into the door, then platform up and around to the right. Scale up to the right and through the door. Avoid the blades and go through the door. (Ignore the knight for now.) Avoid the blades and go around the circle. Flip the switch, then get Key 3.
Door 3 - Leave the room, and go back to where the knight is. Jump left and off the platform, hitting the switch on the way down. (Don't worry about dying.) Now go back and talk to the knight.
Leave this room by the far right, then go left over the wall and out the door to the left. In the dark room, go through the lit door just to the left. Bomb the wall, and through the door.
In this next room, scale the platforms, climb the wall above on the right, then jump to the left to get the treasure
. Now go all the way right, up and over the princess to the door in the top right. Ignore the thief on the left for now, and go through Door 3 on the right.
Key 4 - Make your way to the far right into a dark room. Platform up and get Key 4 at the top left of this room.
Door 4 - Out of the room at the bottom left, go left and through the next door. Go through the door under the thief, back around the princess to the far left door. Bomb the left door and go into a dark room. Scale the right wall until you reach a platform on the left. Go left and get the treasure
. Now go all the way to the left and through Door 4.
Key 5 - In this room, make sure to leave a bat to bounce off of on the way back. I bounced on the first and third, then off the middle on the other side, then vice versa back to the left.
Door 5 - Back into the dark room, and you're going to backtrack allllll the way to the entrance area. (Bomb the wall, go right, through the next door on the left, left past the bats to the far left.) Through the entrance, go left. In the next cold area, go right to the far door.
This is tricky. Jump on the right wing of the left bat. If you do it right, you'll jump into a hidden area in the ceiling. Quickly pull left and grab with your gloves and go up to the hidden treasure
here. If you miss, just leave the room and come back so that the bat resets.
Leave the room and go all the way to the left, bomb the wall, through the door. Right through the next door, then left past the spiders and through Door 5 at the top left.
Scuba mask - You'll see this when you walk in the room. Platform up to it.
Now drop straight down into the water. Go around and get the treasure
Now go back to the surface and out the door you came through.
Dagger - Back to the room with the spiders, through the middle door, left to the door, bomb the wall and through the middle door, right all the way across the entrance zone, past the statue and jump in the water to get a treasure
. Exit to the right and go through the door. Left and down through the door. Bomb left and through the door. Right through the dark room. Platform and scale the right wall. Go all the way left, past the knight, into the water, and get the Dagger.
Once you throw the dagger 100 times, this will pop.
Boss 1 - Right past the knight to the far door. Left over the wall and to the far door. Go through the next lit door, bomb the wall, go to the next door. Use the middle door. Go left, cross the water, and into the door by the statue. Left over the bats, all the way to the left and through the door. Platform up and take the door next to the statue into a dark room. Go all the way to the left into the lava room. Go all the way to the right, across the water. (If you go into the water and drop a bomb, there's a heart at the bottom.) Go through the room on the right.
This is the boss room. Remember that you can use god mode for this. If you fall in the lava, you'll need to restart, even if you kill it first.
Jump to the right platform, and just before the dragon gets up there, drop a bomb and jump to the center, pelting its head with daggers. When it vanishes, do the same on the left. Make sure not to fall off the center platform, using your gloves to hold on.
The dragon will then make a large loop over the top; stay on the center, then jump to a higher platform while it goes around the center.
It'll then shoot lasers. This has no effect on you, just keep throwing daggers. Then the process repeats. Once he's dead, jump to the left. Get the key, then drop to the left. Drop a bomb, then flip the switch at the bottom left. Now leave.
Thief - Leave the room, then all the way to the left. Right through the dark room.
Left past the statue and through the door. All the way to the right and through the door. Across the bats and through the door. Right over the water and through the door. Go right, around the princess, to the top right door. In the room with the thief, scale up the left wall, then turn around and shoot the dagger at the chain above the cage. Then talk to the thief.
Now jump up again to the top left level. Jump over to the right into mid air, and land on an invisible platform. Keep jumping to the right to a hidden treasure
. This should be the last one.
Boss 2 - Go through the right door into the blade room. Go all the way left and through the door. Go right, save at the statue, and through the last locked door.
If you have god mode on, you can't lose. Just keep shooting until it dies. Then go left and flip the switch.
Exit - Backtrack to the entrance area. Right through the door, left past the statue, past the blades to the middle door, through the door by the thief, past the princess to the middle door, all the way left past the statue, and to the center of the entrance area. Bounce off the skeleton onto the platform, then scale the left side of the shaft. Talk to the wizard, then jump into the portal.
Hope this helps!