Always work from the outside to the inside on the perimeter to avoid large
shifting of gems. This will prevent cascades, which will cost time to recover
from. Do not go out of your way for clock matches. Try to incorporate them into
shifts that you have to do anyway to get the target pieces you need in place.
Start grouping clocks in the same general area and they will match on their own
without you taking extra time to align them. Always look at the next color gem
so you do not have to waste time scanning for its location.