Tips


 * Buy the 'Ruby box' Buff as soon as possible, as it generates rubies for you
 * To buy it, open the inventory, select 'Stats', select the 'Buffs' Tab
 * You have to actively click the ruby box at the left side icon menu, when it is ready to get the rubies (5 mins cooldown at start)
 * I would not recommend to upgrade the ruby box after level 1, as it takes a very, very long active playing time for it to be profitable
 * Buy the two inventory space pets first (Deer girl, Fedexer) and try to get them both to lvl 10-12 as after that, it will get hard to upgrade them without items
 * After them, the next best pets are (in order):
 * Skull lime (atk%+)
 * Golden Lantern (def+), Volcanic Scorpion (def%+)
 * Bibi (Cri DMG %+ - this one is only good if you have a decent critical chance)
 * The Pet slots will get more expensive, the more you have, and putting a pet into the storage will cost you 100 rubies, so don't buy just any pet to fill the slots


 * If you want to idle farm stones, buy the following Buffs
 * Auto-Mining Machine (Level 1)
 * Auto combine (Max Level -> Combine every 22 seconds)
 * Super combination Skill (Max Level -> 30% chance to upgrade your stone 2 levels instead of one)
 * For maximum efficiency: Get into a Clan and contribute Stone tokens and Gold daily, when idle farming overnight, buy the "Auto combine time reduction" buff at the guild shop - it will reduce the auto combination time by 10 seconds for 6 hours, so you will auto combine every 12 seconds. I'd recommend to only use the buff once you upgraded "Auto combine" and "Super combination Skill" to max level. Until then, save the Clan tokens.