To open the gong in each level you can use your valuable teleportation device. Drop it to a location so you can return to that location, it can help you overcome the obstacles of the level!

Teleportation Gates can help you pass through moving walls by placing and relocating them in the right position.

Use the portal's ability to pass different levels, this will not be as simple as you think
where!

How to play The Portal Returns?
Move right: use right arrow button
Move left: use left arrow button
Jump: use up arrow button
Set teleport/teleport: use gate set button