depends if you have mainly 3s, mainly 2s or mainly 4s. 2's i wouldnt bother with games, 3's will need adult help but will find a simple game really fun, 4's should have the hang of games and will enjoy em.
if you do a game that involves a 'winner' have a bag of small lollies or ballons for everyone else to lucky dip from to avoid crying etc.
a jumping castle is a great activity though, i have been to a jumping castle party this year and the kids loved it.
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