Diamond Tumble provides short puzzle levels that will get you thinking. Sparing you the whole back-story involving bejewelled monkeys and statues, the main aim is retrieve diamonds from the top of stone towers by using a pick-axe to chip away the stone blocks. Ideally, you'll want to chip away as few blocks as possible to stand a chance of gaining a gold medal.
Level completion only counts if the diamond falls into the vat below the towers (no real explanation is given as to what's in it - could it be acid, water, maybe even chip fat?), so that your monkey allies can retrieve it. If the diamond fails to land in the vat, you'll have to try again.