K&S
gets 20 stickers for 12 questions
Equal Pay
Gets 11 stickers each time (under measurement world)
Pundis Puzzle
Gets 10 stickers each time (under bonus game)
Some bonus games you may not have unlocked yet. You must play skill set to unlock them
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There aren't cheats, but if you complete all 8 skill sets there is Into the Vortex, and that gives you 16 stickers per game plus bonus stickers the next game. To get lots of stickers you need to know and show 24 stickers per category and there are 2 rounds of each category.
The next game is Equal Pay on Measurement World
On the same world, the next games that get you lots of stickers are Equal Length and Equal Weight
Just the facts-15 stickers each 5 questions correct
Pundi's Puzzle- 10 stickers each round
Equal Pay- easy questions on money and 11 stickers if all answers correct
(Pundi's Puzzle you may not have it is in skill set 4 bonus games)
Solve correctly
1,000,000/(number of stickers awarded for each correct solution)
problems.