Let's say the age group is 1st thru 5th grade. This requires games that:
1) are fun
2) keep kids' attention
3) are easy to understand
4) don't (blatantly) single out "losers."
This age group is no doubt a challenge. They will absorb and apply to a point but within about a minute they...yell...run around...hit each other...sit down...fidget...need a drink...