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For all collection events
- Don’t collect battle pass rewards until the end of season, in case a collection event comes around (exception would be if collecting shards could help you star up a hero)
- Before collecting “Daily Gift” login rewards see if there’s a collection coming up - for the last collection event (Rings) I got 20 from the Daily Gift by waiting a few days (still was able to collect all the gifts)
For crystal event
- Best source to get crystals are the daily dungeons - both completion rewards (Easy: 10, Medium: 20, Hard: 30, Nightmare: 40) and drops during the run. I don’t recommend recharging for 100 gems just to get another 3 runs at crystals. But you could do it if you wanted the shard but didn’t get it in 3 runs, you want more keys, or you missed nightmare (or even hard) with a bad perk roll and want another try
- Castles provide decent drops as well (although less than daily dungeons) but the drop rates don’t increase at higher floors as far as I can tell. If you are tight for energy to play and have enough keys, go in with 1 hero (it will warn you but allow you to proceed) and play just the first 9 floors for 3 energy each. Then start the 10th and either suicide or exit the run and start again with another key. You could extend this to another 10 floors at 4 energy each
- Always go for hidden treasures.
- Use jackpot if you have him - he can proc crystals.
- Take the crafter perk in castles (and maybe daily dungeons) - it increases drop rates of crystals
- You can also get crystals from summon gates but I wouldn’t recommend buying them for the crystal event (although you could save up some keys for it)