When starting the "Swamp Outpost" level, roll to the right to reach the entrance to an area where many explosions are placed. Instead of entering, roll in front of it upwards and move to the right. There are some holes down from here. Roll on the outer right hole and press ACTION to warp to level 8.
On the "Perilous Ski Slope" level, the secret warp is just before the exit. Get to the area with the breakable floors and the arrows in front of the exit to find the secret warp. Roll on the top-most hole on the second cell from the right. Press ACTION to warp to level 15.
On the "Bomb Chase" level, the warp is located just before the checkpoint. It is a hole you can reach when the pressure pad is used and the "pressure floors" are visible. From the checkpoint, roll up until you reach the curve. Roll onto the second hole from the top on the right side and press ACTION to warp to level 16.
Play the "Acid Leak" level until your ball gets smaller. While small, roll down to the place you build the bridge, but do not roll across the bridge. You can then carefully roll slowly beside the wall even when there is no platform. You must roll to the right side. There are many edges to avoid. You will eventually be exactly under the place where the "small-ball" tool is placed. Roll one field to the right then roll down on the hole and press ACTION to warp to level 18.
On the "Heat Wave" level, start by rolling over the bridge to get the two construction blocks. After that, roll to the large area below. Notice the power ball On the upper right edge. Collect it by constructing a block over the hole. Roll below to the part of the level where you can get the green key, then roll through it until you reach the part where the orange gem is placed. There is a breakable section of wall directly above the teleporter. Use your booster to break through it. Use the teleporter to warp to level 5.
On the "Abandoned Stronghold" level, after returning from the first teleporter in this level, build only one bridge to the right where you normally must build three bridge parts. Roll onto the next hole to the right and press ACTION to warp to level 11.