Rocks, referred to as "Giant Rocks" in Animal Crossing: New Leaf when constructing Public Work Projects, are scenery items that appear in every Animal Crossing series game. They are impassable, and they obstruct Public Works Projects. There are usually five to eleven rocks in a player's town. Depending on the season, hitting the rock with a shovel or axe may cause a Pill Bug or Centipede (Animal Crossing: City Folk onwards) to pop out. Some insects can only be found using this method. Rocks cannot be picked up or moved. Rocks cannot be broken or removed except in two circumstances. In Dōbutsu no Mori e+ they can be cracked to see Resetti in the Resetti Surveillance Center, but it will respawn the next day. In Animal Crossing: New Leaf, there will be a daily randomly generated "fake rock" in addition to the town's permanent rocks. Hitting it with the shovel or axe destroys it and spawns an Ore.
Once a day, one of the rocks located in the player's town will become a "Bell Rock". A Bell Rock looks identical to regular rocks. Hitting this rock with a shovel will cause Bells to pop out. The player has about 10 seconds from when they first hit the Bell Rock before the rock turns back into a regular rock. Each time the rock is hit in succession, an additional Bell bag will pop out, containing more Bells than the last Bell Bag. The exact values of the Bells varies between games, but it usually follows the trend of the first bag being worth 100 Bells and each successive Bell bag being double the previous. Hitting a hard object with a shovel causes the player to shift back slightly, so it is advised to dig a hole behind the player before hitting the rock to counteract the movement. This way the player does not have to spend time relocating themselves once the Bell Rock's 10 seconds begin.
Once a day, a new rock will appear somewhere in town that, when struck with a shovel, will break and yield a single ore from the debris. They only appear in Animal Crossing: New Leaf. It looks identical to the other permanent rocks and it only takes one strike of an axe or shovel .(Note:if no one hits the "Gem Rock",no new ones will appear until someone hits the rock and waits the next day)