Level 131
Level 132
Level 133
Level 134
Get past them all one at a time. Lure them to the top. Go down the left-hand ladder and run as fast as you can to the bottom right to dig six holes for them to die in. Run up to dig as many holes as possible, then do a little jig on the bottom-right ladder so only one of them dies. Go down, dig two holes for them, run over them, get past the one higher up, and go get the rest of the gold. If you do it right, you can get one or more to fall in the tall thin (upside-down T-shaped) tunnel and stay there. Or you can dig out the whole 3-by-3 block at the bottom, dig a bunch of holes for some of them to die in, and go back to the left of the block before it fills in. Then go up and over, go past whichever one(s) are left down there, then get past the ones higher up.
Level 135
Level 136
As much as possible, dig only the highest two layers you can get them to fall into, and don't dig any more holes than strictly necessary.
Level 137
Level 138
Keep separating one from the pack at the bottom right. Hang from the rope until it goes up the ladder, then drop and run and dig holes to get past the other two.