Board Thread:General Discussion/@comment-110.33.114.124-20130103234619/@comment-5896727-20130111202525

Yes, you can also upgrade them simultaneously if you want, considering that the low levels are far easier to lvl than lvl 25-30+. So you may end up with getting more power value with upgrading lower bots. Keep in mind though, that the bots should get the 3x multiplier in battle meaning, that you should focus on your 3 best cards in your team.