Talk:Perseverance/@comment-31462314-20180530162056

Even though it is 20 GC cheaper to upgrade to 3353334 which is required to 100% finish the series it is in, if you are having trouble with this SE and need to upgrade beyond all 3s, I think it is smarter to cough up the extra 20 GC and upgrade to 5353333 instead. So essentially instead of the 4th tires gold upgrade you slap on a 4th engine gold upgrade for 20 more GC, but get a "free" additional engine 5 upgrade that only costs R$ which should put you are +1 upgrade compared to someone who upgrades to the RR3 upgrade strategy's recommended 3353334 and therefore make the SE easier for you without incurring the usual gold cost associated with an additional upgrade.