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@pako
@noahlot, to make any progress in the game you’d need sparks to have your bots promoted. If I were you, I’d keep the gems (and collecting them) until there is a chance to get a sparkworthy bot (much needed to get sparks). See link above to get a ranking of all the bots based on their worthiness in the spark run. Also, search the forums for spark run killers.
Beware, once you start purchasing bots at 750 gems, the price is likely to increase anytime in the future. My last bot offer stood at 5000 gems.