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@millforce2k
Cost is increasing (between 301 and 309) by 700 coins per level, with every fourth level costing 800. If this continues, though I’m sure it will start jumping higher, it will cost almost 60M coins to go from 301 to 500.
I used @grimlockdown’s strategy. I already had Mirage at green crown, so I promoted Sideswipe and Sunstreaker to gold crown for 1680%. Finished in five stages, going into the sixth. Still needed 1305200 total points, but the targets were worth considerably more. Gold blocks when from a little over 8K to over 19K.