On Vigintia, there is a swimming zone, a bridge to the island of Nostalgia, and a big tent with 2 games to participate in: Can Knockdown and Treasure Hunting.
Can Knockdown
Talk to Vigintius and say “Can Knockdown.” He will charge you 100 gp for one throw. Head north and you will see two market stands containing ten stacked cans each. Walk up to either and watch the cross move and change color to indicate position of impact. Once you've decided at which of the three crosses you want your pebble hit, use the right side of the stand to hit the cans. The green X will knock down the most cans. You can now collect your reward from Vigintius by asking for reward and indicating whether you deserve the bronze prize, the silver prize, the gold prize, or the main prize. The more cans you've knocked down, the better a prize you deserve.
You can play this game as often as you wish. Keep in mind :
You are guaranteed to obtain the bronze prize by using the stand when the bottom-left X 
is visible.
You are guaranteed the silver prize by using the stand when the bottom-right X 
is visible.
You are guaranteed either the gold prize or the main prize by using the stand when the 
is visible.
Tibia's Anniversary Prizes:
Bronze Prize: 
Costume Bag (Retro) (one to four cans);
Silver Prize: 
Meringue Cake (five to seven cans);
Gold Prize: 
Birthday Card (eight or nine cans);
Main Prize: 
Birthday Cup (all ten cans).
Treasure Hunting
Vigintia has a treasure cove to the south-west; talk to Vigintius and say “treasure hunt” and he will charge you 150 gold for 90 seconds of digging. The 90 seconds begins when using the Closed Fence Gate 
to enter the treasure cove. You will be teleported out when your 90 seconds are up, but you can leave any time by using the Closed Fence Gate 
again. You can only dig with a Shovel. Light Shovels and Secret Agent Tools do not work. A Shovel can be purchased by asking Vigintius for a trade. Simply use the Shovel on a tile to have a chance to dig something up. The items you can dig up are:
There is a limit of digging 101 times in 20 hours. If this limit is exceeded, the message “Your arms hurt from your efforts to find treasures on this beach. You should have a break. Return in some hours.” will appear. If digging is attempted again before 20 hours pass, the attempt will fail with the message Your arms still hurt from your efforts to find treasures on this beach. You should have a break. Return later. Failing to dig until exhaustion will result in the number of digs never being reset. For this reason, it's recommended to enter the treasure cove twice or more until you receive the exhaustion message.
Source: https://tibia.fandom.com/wiki/Vigintia
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