The Silver Rupee is a valuable Rupee that appears in many Zelda games. It is usually found in Treasure Chests, though in Ocarina of Time, they have a unique function tied to puzzle solving.
Ocarina of Time
In Ocarina of Time, the Silver Rupee is worth only five rupees, but is used as a challenge in dungeons. Certain dungeon rooms require Link to collect all the Silver Rupees in a room to unlock a hidden area or locked area.
In Majora's Mask, the Silver Rupee is worth 100 Rupees.
The Wind Waker
In The Wind Waker, the Silver Rupee is worth 200 Rupees making it the most valuable Rupee in the game.
In Twilight Princess, the Silver Rupee is worth 200 Rupees making it the most valuable Rupee in the game.
Completing the Poe Soul quest gives Link access to an infinite source of Silver Rupees. If he collects all 60 Poe Souls, and then goes to see Jovani, he thanks Wolf Link and gives him a single Silver Rupee. However, if Link exits the house, re-enters it, and speaks to Gengle, Jovani's cat, he will give Link a Silver Rupee. This can be done unlimited times.
In Skyward Sword, the Silver Rupee is worth 100 Rupees.
Breath of the Wild
In Breath of the Wild, the Silver Rupee is worth 100 Rupees.
The Silver Rupee from Majora's Mask