Big Groups:

Stand Up!

Its recommended to have at least 5 people to play it so I’ll explain it with 5 players.
Everyone has to sit down. Now someone has to stand up and shout “1”. But there’s no settled order. No one knows who will stand up but if more than one person stands up and shouts “1”, they are all out and the remaining players continue the game starting with 1 again. If only one person stands up and shouts “1”, the person is safe until the game ends. Now the next person to stand up has to shout “2”. If this person was also the only one and the one to shout 3 and 4 too, then the remaining last person loses the game.

The Flying Coin

materials needed: tape, a bowl (not too large but also not too small) with a bit water in it and coins.
You make a line on the floor with the tape and put the bowl a few meters behind the tape-line, about 2~3 meters (you can change the gap). One team starts. The members of the team have to stand ina a row behind the line. One after another, they have to throw the coin into the bowl. The first team where ALL members get their coin in with one try will win the game.

Small groups:

Hit The Mark

materials needed: piece of paper, marker, tape, (prizes optional) instructions: place a poster high up on a wall. one person runs across the room and jumps up, placing a mark as high as they can. then they are told to try again but place it higher. then the team is told they will be rewarded (ice cream, longer lunch honker, etc) if they can get this person to ale the mark higher. however, they cannot do it for the jumper and can’t touch them or provide a chair or other booster. they can only do this through encouragement.

Twenty questions

20 questions is an old party game which encourages deductive reasoning and creativity. One player is selected to think of an item. The rest of the group tries to guess the item by asking a question which can only be answered with a simple "Yes" or "No." Truthful answers only please, as anything else will ruin the game.

Catch the Thief

This game is played in a group (recommended to have at least 5 people).
You need as many cards as players (the cards have all the same back). On every card’s face is the same picture except on one (on this card stands thief). The cards will be distributed face down to the players. The players are sitting around a table and the game starts with the first player who will just give his card to the second player. The third player can choose one card from the second player (he only sees the back of the card). The fourth player can then choose one card from the third player and so on. When the last (first) player has chosen a card the game is over. Everyone has to show their card’s face now. The player with the thief card loses the game.