BOXBOY! + BOXGIRL! may start off pretty simple, but it gets tricky pretty quickly. So let’s get started on the co-op segment: World 3 (Once Zapped, Twice Boxed)
As there is a lot to cover, you may stumble across a solution to a level that may either be incomplete or not to the best it could be. If you have any solutions, please be so kind as to email us at firstname.lastname@example.org and we’ll be sure to provide credit if we use it.
Boxes Used: 4
Make a single box and throw it into the zapper pit to jump across. Do the same for the second zappers.
For the Crown, make two horizontal boxes and throw them into the middle of the pit. Have both of you jump down and one stands on top of the other to grab the Crown and proceed to the door.
Boxes Used: 10
Have the top player drop a box down through the zapper and the bottom player make a box just left of it to use as stairs.
For the Crown, have the top player drop a three-boxed backwards L down for the bottom player to use to reach it.
Then the bottom player can push those boxes to the right in order to use them as stairs. Once that’s done, the top player can dismantle those boxes and make two horizontal boxes, with the left box teetering on the left edge, and use them as a bridge to get across.
Lastly, have the top player make another three-boxed backwards L and have the leftmost box teetering on the edge so that they can reach the Crown as shown below. Once that’s done, push the stairs down and use them to get up to the door.
Boxes Used: 5
Have one player make three vertical boxes and throw them the furthest into the middle as possible. Then the other player needs to make two horizontal boxes and throw them so that they land on the others, allowing them to grab the Crown and then move to the door.
Boxes Used: 12
Do as shown in the instructions with only three boxes and get to the blue button, allowing you to move on.
For the Crown, push BOXGIRL up three times, allowing her to reach it. Then move over to the left so that she can make a box on the red button to open the roller door.
Now that that’s done, have BOXGIRL make two horizontal boxes and throw them into the middle of the zappers. Have her jump on top of BOXBOY, then both jump onto the boxes and then build three blocks up so that BOXGIRL can jump to the Crown by BOXBOY jumping first. Then with the boxes still up, have BOXGIRL get to the blue button, opening up the way to the door.
Boxes Used: 6
Have BOXBOY make three horizontal boxes and throw them down onto the spikes. Then have BOXGIRL make three boxes upwards so that BOXBOY can stand on top of them and get to the other side, where he can then jump to reach the Crown.
Boxes Used: 12
Have BOXGIRL make four horizontal boxes and drop them down to where BOXBOY is so that he can push them into the blue button.
Then do the same for the right side but three right and one up, allowing both players to climb up and collect the Crown.
For the last section, BOXGIRL needs to make three boxes in the shape of a forward facing L and throw it to the button on the left whilst BOXBOY makes a single box and throws it to the button on the right.