Do you like the Gemcraft chapter 0: Gem of eternity flash game? Ever wondered how many time the top scorers spend to land somewhere in the top ten? Here’s a tip how to make a pretty high score. And this can be really simple. Just start the last level.
Combine the blue, red and orange gem together and throw the rest into monsters.
Now just collect the mana and make more orange gems.
Combine, combine, combine till you reach the upper limit.
Now, you can upgrade the mana pool and create more such gems.
The third one.
For over 1’000’000’000’000 score it will be enough now. Throw gembombs into monsters and upgrade your mana pool. More monsters = more mana 
When we see the wave 54 we can start throwing (casting anger) 6th grade gembombs into them.
1007*1668694*1.5*5.3 is less than 1’000’000’000’000 so we throw more of them.
Yay! Now we can just wait till they come out and destroy them with our Gem of Eternity.
At this point my computer is really slowing down. 0,5 frame per second or even less.
Combine the 7th grade gems and destroy the seal. You will have to throw the gems dozen times. In the end you’re the winner.
And the total score:
With this strategy you can make insanely high scores. But – unfortunatelly – the high score board will not accept scores that are to high (over – I think – the 5000 level). Reason? I don’t know, but it looks like an anty-cheat measure. Such a shame, because I have also a score that is 10 times better than this. The tactic is the same. Screens:
Well, as you can see 99% of the final score can be gained on the final level. So it does not make any sens to tune every single level, just go “directly” for the last one and forget the rest. But remeber, having more then 10.000 monsters walking makes your computer pretty slow. You might get something as slow as about 3 frames per minute! Yes, such a game might take days to end (took me about 3 days to make the score above). So before you go, make sure you have plenty of of free time. 
Good luck and high scores to you!
