One of two solutions: Run as fast you can. Stay put if you're trapped between its two ends. Jumping on this map usually leads to death.
Another solution is to wait until your shaman (most likely) places a fixed ghost plank on the Anvil God's red nail or until he blows it out with spirit (highly unrecommended).
Keep in mind that when the Anvil God slows down to a near halt, it will quickly amass energy and flail around like mad again, so never be near it when it has calmed down. Some people call this mad swing a Swing of Faith.
Either place a fixed ghost plank on the Anvil God's red nail,or use a spirit with N on the Anvil God's red nail. The shaman can also block the left side of the map with large planks so mice won't get blown off.
Hard mode shamans should rely on ghost parts of their totems and keep building sturdy ghost stands and balloons to hold up the anvil god. A wall at either side could be done but is not as effective as in normal mode.
During Christmas and Easter, there will be a present or an egg at the top of the anvil god, nearly impossible to obtain without killing yourself, those who do manage to get up must quickly get down before the anvil god spins around pushing you off the cliff. The best way is to quickly jump onto the anvil god's arms at the start of the map. You can then climb up and safely get the present or egg, but even that takes a lot of risk.
BugSometimes anvils won't be attached properly and anvil god will spawn immobile on the ground.
BugSometimes the Anvil God spawns twice. Even more rarely it has spawned 3 or more times.
BugA rare thing to see is the "anvil god" spawning with a bomb or other object in the middle of it.
BugIt is a possibility that the anvil god is carried along to the next level when the level change is triggered by the increase in the number of mice (1 to 2 or 2 to 3 change). Also, it is only for the already present mice, not for the ones who just connected.
BugSometimes anvil god have delayed spawn - in this case, at start of map only fixed anvil appears - and after some time the rest of the anvil god appears
BugSometimes the anvil god can be "attracted" to the corner of the map
BugRecently with the change in how a level is generated, Anvil God now loses a hand. Only one hand of the anvil god works.The anvils from the other hand might block the cheese and the hole
The Anvil God went weak and stopped moving. (2 July 2010 update broke the map, but it's been fixed.)
More anvils were added.
Anvil God spawned twice, making it a lot harder for the map to be completed, unless the shaman spirits the center of the b joint correctly.
A glitch at map 62 after map 7, where a bomb get attached at the red nail of the central anvil, and the anvil god's "arms" fly over all the map without control
The anvil snake was moved to another level.
The anvil god spawned four times Sunday, 17 October at 8:48pm NZST
Most of anvils were delayed and were not spawned with the fixed anvil, but after some time.
The Anvil God was stuck in the top left corner.
The Anvil God is "attracted" to corner of map.
A Triple Spawn Anvil God. All Mice on the screen survived and finished.