User blog comment:Luke5704/Crystals being spent when game freezes!/@comment-192.249.47.163-20120919171431/@comment-5039776-20120919235007

This is such good advice!

Remember, it freezes for a couple of seconds every minute to upload your game data. If you tap during that time, the taps are kept in a buffer.

You can buy anything in this time, dinos, expansions, resources.

Be careful during the freeze.