How about this:
Set one bear's size to say, 150. Then another to 200, and one to 100.
Then, add a new rule that happens 'When Bear 1 is tapped.' Bear 1 would be the one at size 100.
Then, 'Set Value (value1) to 5.'
Then add a rule to Bear 2, the one at 150. 'When Bear 2 is tapped'
Then, 'Check once if (value1) equals 5.
Inside the Check Once If, put 'Set Value (value2) 6.'
On the biggest bear (bear 3) add a new rule that happens 'When Bear 3 is tapped.'
The rule would be, 'Check once if (value1) equals 5.'
Inside that, put another check once if, which should be:
'Check once if (value2) equals 6.'
Inside that, put whatever code that you want to happen when someone taps the bears from smallest to largest!
I hope it was clear, tell me if you need any more help!