Beware of the spiders in this level. You may want to complete this as quickly as possible.
With the blue player, go down twice, right three times then left three times.
With the green player, go down twice, left three times then right three times. If you do it right, you can do both these steps at the same time.
Get both players to go up one space. Push the rock to the right, then move left once. You could also do this the other way around.
Dig through the earth two spaces below the rock, then go up once. Move to the side to let it drop.
Collect the crystals at the top, then the bottom of the level.
There are two squares of earth on both sides of the level with bombs on the other side. Dig through the bottom one, then the top one, then move right if it's on the left side or left if it's on the right side. Do this on both sides, and if you can, both at once.
Run and collect the last two crystals below the spiders.