Look at the bottom of the first image. See the brown apartments? The one on the left is an '8' and the one on the right is a '9'. Merge them to form a 10. Once a building becomes a 10, it then turns white.
Suppose you combine 10's: two of them will form a yellow 11. However, you cannot combine any building over 10. The key strategy to scoring BIG, is to get a super cluster of 10's and then merge them all at once.
SubaraCity was created by Ryuji Kuwaki. A typical game for me is getting 2,000,000 points and that takes about 15-20 minutes. My high score is 32,927,440 which ranks me at 4268 out of 144,509 players. I got by combining fifteen 10's. It led to a level 24 building. That particular game took over an hour.
So now I'm trying to beat my top score. Extremely difficult. Here's what's been happening: I get a cluster of twelve 10's and then am forced to merge them. The resulting 21 building (I know - why isn't it a 22 building?) becomes a dead space on the board. So I end up restarting the game. Which makes me despair a bit.
SubaraCity is in the running for a PAGY Award. (Nominations: check back on December 30th.)
Other Point Scoring Games Worthy of Your Time
Four Straight Lines