4 games in one: 1. The Plus-detectives Whoever is savvy and has lots of luck will collect the most number cards. 2. Quick Plus-detectives Play according to the rules of Plus detectives, except for the players calculate all at once. 3. The ten times table detectives Whoever is savvy and has lots of luck will collect the most number cards. 4. The speedy ten times table detectives The same rules apply as in the “Ten times table detectives”, except all players calculate simultaneously.