These are just a few ideas I have for this project. If you like them, use them! Otherwise, forget they're even there :)
Archery
Basically you get a bow&arrow and these balloons are floating upwards (or are stationary). Simply pop them! You get points depending on how many you get. Some balloons may be worth more than others if they are harder to hit. You can change how powerfully you are throwing the arrow.
Collect a Lunch!
Each player must try to scavenge all the ingredients/foods needed to have a basic, pre-determined lunch and put it in their Lunch Box. The first one to do this wins the most points. You also get a sword and so can fight over food (since it is limited) to try and slow others down. If you get bloxxed, your spawn is back at your lunch box [and you lose any food you were holding to the position where you were bloxxed].
Tower Builder
Everyone must build a tower that they can climb up to a platform with. After a couple minutes (1 to 2), everyone is teleported to a platform that is out-of-the-way where they can watch the "destruction", since a "wind" of bricks (or a tidal wave, hurricane, etc.) will attack all the towers at once (equally in strength). If a tower wasn't build strong enough, it'll knock some or all of the tower down (ex. a simple stack of bricks will likely be blown over).
After this, everyone is teleported to their tower (and bricks that separate all the towers [invisible] will be put back in so you can't use another person's tower), and then you get say 30 seconds to climb as high as possible on your own tower to a certain platform. The higher you go, the more valuable the platforms are. Multiple people can be on the same platform. You will not be able to build during this time of 30 seconds. If you aren't on a platform, you don't get any points.
Bridge Builder
Everyone has their own "ally" to build (just like in the above idea, Tower Builder, there are separator bricks so you can't use other people's bridges). Everyone must do their best to build a bridge as quickly as possible as far as they can, but if they aren't careful, natural disasters may destroy part or all of their bridge. If they want to risk distance for being unsafe, that's their choice. The disaster scripts would be random on where they strike, so anyone could be hit, or everyone, or no one. A natural disaster might be a bit of "lava" from below flying upwards and hitting a bridge, or a rock from the cliff above (however it is designed). The farther your bridge reaches, the more points received.
Car Race
Special cars (with more proper physics than current cars), all with different characteristics (such as speed, acceleration, turning power, and how strong/durable the vehicle is), can each be chosen by a player (2+ players can have the same type of car). There would be 2 laps or so on a good terrain (with bumps and hills) that include several turns. Collide with something and damage would be assigned based on speed and how directly the object was hit [less damage if you are just touching it with the side of your car compared to head on].
Plane Race
Same thing as Car Race, but with planes and checkpoints that must be touched in order to win.
Rock Dodger
Everyone is in their own small, circular boat that can go in any direction at any time [using a special new boat tool :) ]. Large rocks or boulders would fall, hit the water (crushing any boat it hits), then it would explode into more smaller rocks that would fly up and back down, also crushing any boats they hit. (So 1 boulder into say 5 to 8 rocks). Simply last the longest for more points. As time progresses, more boulders would fall.
If you've lost on a game…
Then they'd have the option of doing a slide puzzle that forms an ERRC decorated decal. One of those 4x4 (or 5x5 if we wanted) puzzles where you slide each square into an empty space until it forms the desired picture.
Hope you like these ideas, I know they would spice up the minigame world,
chess123mate