The 10 Gold Coin is a type of coin that will give the player ten gold coins when it is collected.
 Game History
The 10 Gold Coins would first appear in Super Mario RPG: Legend of the Seven Stars alongside the regular coins and Frog Coins. They would look like regular coins in this game though they would be larger than regular coins.
They could also be seen in Mario & Luigi: Partners in Time. Their appearance in this game would have them showing a 10 on them and could be found in ? Blocks or in the chasm in Thwomp Caverns. They are bigger than regular coins and will give them ten coins when collected.
The 10 Gold Coins would return in New Super Mario Bros. 2. They would have the same design as they did in Mario & Luigi: Partners in Time and could be found in Roulette Blocks that produce coins.
 Wario Land series
The 10 Gold Coins could be found in Wario Land: Super Mario Land 3 where they would look like normal coins but have a cross stamped on them. They would only appear after certain enemies were defeated in a certain way and would make a unique noise when they are collected.
Wario can also use this item to throw at enemies by pressing B button and "up" on the directional pad. This will cost him ten coins and it is necessary to open Goal Doors and complete the level.
It would return in Wario Land II under the name Wario Coins. They would be golden coins that have Wario's face on them and are a lot bigger than regular coins. Wario's coin counter will increase by ten when he picks up one of these coins and they will give off a unique sound when collected. They could be used for purchasing minigames to find hidden treasures.
Wario Coins could be found in secret rooms or locations that are hard to access.