Repton needs to collect all the diamonds, earth and puzzle pieces as well as killing all the monsters and using all the transporters.
LEVEL 1 (Red)
Move right from the starting position to collect two diamonds. Take the transporter to the puzzle assembly area, then go up to a hub room with ten transporters. From left to right, the transporters on the left side go to Level 6; Level 3; Level 4; Level 5; an enclosed room in Level 1. Those on the right side go to Level 7; Level 8; Level 9; Level 10; the main area of Level 1. They can be taken in any order.
[Enclosed room]
Push the rock, let the second rock fall, and take the earth under the egg. Take the diamonds and transporter, which goes to Level 2.
[Main area]
Repton starts this area above an egg. Push the rock below it one space to the left, then push the egg so it falls behind the rock, and kill the monster.
Just to the left, collect the key and release three spirits (their cages are already open). Go up and right from Repton's start and cross to the other side of the level; release the remaining spirits from the symmetrically positioned chamber. Go straight up to the top of the level; unblock the cage on the far right and the cage just below it.
Now go around the level collecting everything. The bottom eggs are easily dealt with by breaking them and running behind the nearby rocks. When you reach the area under the last cage, take the puzzle piece, then let the middle rock fall to the right, then push the top rock to the left to access the bottom diamond.
The chamber in the middle of the level is blocked by a guardian skull, which disappears when you have collected all the diamonds on all 10 levels. After taking the earth and puzzle pieces in this chamber, go to the bottom under the transporter hub to finish at the starport.
LEVEL 2 (Cyan)
Go to the right to get the key. Come up on the far left (letting the rock fall on the egg) and push the top rock into the spirit's enclosure; then get out of the way. Go back to the key's location and head up, unblocking another cage and releasing its spirit.
When the spirit has gone past, head to the top-right of the level and come down the inside of the wall enclosure; let both rocks fall off their diamonds to get past. Now you can collect everything remaining on the level and transport out.
LEVEL 3 (Magenta)
Go up and release the egg, then stand on the savepoint, where you will be safe as five spirits come past. Four will go into their cages, and the last one will go past the monster and back out. When it does, do not unblock the last cage! Go right and up, past the rock, so the monster comes towards you; push the rock to kill it.
Wait in the top-left corner. When the spirit comes past again, go over the level and unblock one of the top two cages on the far right. Go over the level again, take the diamonds from the first group of cages, and unblock the last cage on the left side.
Go back to the far right; unblock both remaining cages, then release the spirits. Enter their enclosure, let the bottom rock fall, and get the key. Push both remaining rocks to the left, then let them roll off the walls; now you can finish clearing this area.
Go back to the left side of the level, and take the last cage diamond. Go under the rock above the transporter, push it left, and let the other rock fall. Now you can clear up and finish this level.
LEVEL 4 (Blue)
Walk straight down three spaces between the rocks, then up so the right rock falls. Let it roll right off the diamond, then push the other rock left. Push the loose rock right and continue down. Deal with the next pair of rocks in the same way and keep going down.
Clear out the diamonds and puzzle pieces under the top area, then go back up. Start clearing out this area from bottom to top, but when exactly three rocks have fallen out, go down and push the loose rock two spaces right. Now you can safely clear out the rest of the top area.
Come down on the far right; get the puzzle piece and its counterpart on the left, then let the rocks above them fall. Push the rock to access the bottom middle area, then go down and clear out the very bottom, then clear up the rest of the level and finish.
LEVEL 5 (Green)
Take the diamonds to your right, unblocking access to the meteor area. Go left under the egg; release one rock and use it to kill the monster. Unblock the top-left cages.
Head to the right along the middle passage; let both rocks fall so you can get past. Deal with the top-right egg in the same way; unblock the top-right cages and access to the meteor area from this side.
Enter the middle area and start releasing the spirits, releasing each group by taking the rightmost diamond blocking them, then dodging to the left. When you reach the egg on the left of this area, take the puzzle piece, then run down and right (the egg will not kill you). All spirits but one will now cage. Wait near the top-right cages; when the key becomes available; take it, go back along the middle passage, and unblock the cage in the bottom-left corner. Come up to avoid the last spirit.
When the spirit has caged, clear out the second passage from the bottom, so the rock at its end falls. Go along the bottom passage and up on the right; deal with the egg in the same way as the last one. Now you can clear up the level and transport out.
LEVEL 6 (Orange)
Let the first egg fall, and let the rock roll off the savepoint. Take the diamond under the second egg, then let the rock fall off the diamond onto it; repeat this with the remaining eggs. Continue up, unblock the cage, then release the spirit. Now just collect everything remaining on the level.
LEVEL 7 (Red)
Go down to the bottom of the level, then up the passage just to your right. Take the diamond above the egg, then take the key and the adjacent diamond.
Go to the bottom-left corner, then come up, letting the rock fall. Continue to the top-right, and push the rock onto the egg. Now go to the bottom-right corner, take the diamond under the egg, then run down and left (similarly to Level 5). Collect everything remaining and transport out.
LEVEL 8 (Blue)
Immediately take the first three transporters to reach the top area. Take the bottom diamonds, then let the rocks above them fall, giving you access to the key. Take it, and enter either one of the side chambers. Head down by hugging the middle wall, and clean out the bottom area. Now come up on one side, cleaning it from bottom to top so the rocks will not be a problem. Repeat on the other side, then finish.
LEVEL 9 (Red)
Quickly run to the right and come up three columns to the right of the savepoint, avoiding the spirits. Let the rightmost of the three rocks fall and push it left to the bottom of the level. Take the earth next to the bottom of the cluster around the key, and move up, letting the second rock fall. Walk under it and push it right, onto the first rock. Now push the last rock to the right; it should land on the remaining earth tile, completing a chain that connects the enclosure to the bottom wall.
When the spirits have caged, go to the bottom-right corner of the level and get the diamonds; only then take the key. A rock will fall near the bottom-right corner; push it to the right until you can get around it, then push it left.
Deal with each egg in turn by clearing a complete column of earth so the egg falls all the way to the bottom; run behind the nearby rock and kill the monster.
LEVEL 10 (Cyan)
Go left and take the first transporter. Head right, letting the rocks fall off the walls so you can get past, to the second transporter. Go to both sides of this area and take the diamonds under the rock-on-safe traps; then take the key. Make sure you take all diamonds and puzzle pieces in this area, then take the third transporter back to the first area. Similarly, clear up this area, then take the transporter on the right.
Run to the left along the bottom, under two rocks, an egg, and another rock; use this to kill the monster. Release the remaining eggs one at a time by dropping them to the bottom level, then get behind the same rock to kill each monster in turn. Get all the diamonds, then run through a sequence of three more transporters to finish.
Welcome Walkthrough Video (by Tony Houghton)
This video shows the PC version. The bottom-left of Level 2 is slightly easier to complete in the iOS and Android versions.
Welcome Walkthrough Guide (by Michael S. Repton)
Repton needs to collect all the diamonds, earth and puzzle pieces as well as killing all the monsters and using all the transporters.
LEVEL 1 (Red)
Run straight to the right, and get the key. Head up where the safes were, and push the rock to your right to kill the monster. Collect all the diamonds in this area, then take the transporter beyond the savepoint.
Clear the second room from bottom to top, and take the second transporter.
In the third room, collect the diamonds and puzzle pieces and head down. Let the egg and rock fall to get past them, and take the third transporter.
Now clear the top-right area. Note that you must take all available puzzle pieces (you should have 24 remaining) before taking the next transporter, at the top of the level.
LEVEL 2 (Blue)
Take all diamonds in the first room, and push the lower-right rock to escape. Continue to the right, and release the rock blocking the spirit so it goes into its cage. Come down on the far right, and get the key; the rock will fall onto the monster automatically.
[PC version] Head along the bottom of the level to the next egg; go under the egg and the next rock, and use this to kill the monster. [iOS and Android versions] Head along the bottom of the level until you reach the bottom-left corner; go up and use a rock to kill the monster.
Before taking the transporter, make sure you have taken all diamonds, earth tiles and puzzle pieces in this part of the level.
Come up to the top of the level; head over the top and drop down into the middle chamber. Take all available diamonds, then continue to the top-right area. Take the transporter, which releases the spirits; they will cage automatically. Now take all diamonds in this area, and continue left to the next transporter. Before taking the final transporter, check the map to make sure you have fully cleared the entire level.
LEVEL 3 (Magenta)
Immediately take the adjacent transporter. Come down on the far right, taking all available diamonds. Go past where the transporter was, and push the rock to kill the monster. Two of the rocks in the large pile have spaces beyond them; push these to let the top rocks fall so you can get past. Now clear up the rest of the level. The top-left skull will disappear when there is only one puzzle piece remaining in the scenario (the last piece is on Level 1). Take the transporter.
LEVEL 1 (Red)
Head right along the bottom of the level, and come up on the far right. Take the transporter, which goes to the top area. Now clear up the rest of the level. The skulls in the top-left will disappear when all earth tiles in the scenario have been cleared; if you have left any earth behind on this level, you can push the rock near the first savepoint left to access earlier parts. Take the transporter beyond the skulls and go along the bottom again to reach the starport in the bottom-right corner.