I think a team spirit thing could be cool. It could be kind of like the Pokemon GO team prizes, where not everyone had to join in to get points but like 5 out of the 10 members had to complete the challenge and then the whole team wins.

Like the first team challenge could be to decorate your signature and/or avatar in some way relating to your team. And if 5/10 of the team complete it, the team gets 10 points or something.

Then the next team challenge could be a wordsearch or something. If 5/10 people from the team complete the wordsearch in the right amount of time, the team gets 10 points.

It could basically incorporate the puzzles/games we were going to have and make them all into team events. What do you guys think?