Talk:Project Impulse/@comment-49.248.127.27-20150426064909/@comment-80.12.59.172-20150426093634

unlike previous challenges, you will have to buy the R$-only upgrades very shortly. buy them when you can

gc upgrades are needed from 4.6 if I remember correctly

I've bought 3 of them (+the following R$-upgrade) and it's ok so far (I'm in the middle of stage 6)

maybe 1 is sufficient!? but challenge finish tomorrow, we will see