Artifacts are only available to unlock in monthly Events and provide various bonuses. They were first introduced in patch v0.99.55. Artifacts are leveled up with Artifact XP, which is also gained from events (granted retroactively to all participants). Some base experience is also granted for each artifact. Hover over an artifact's image to see the date you earned it.
Prior to patch v1.0.0, during the Match 3 Event in August 2019, the Artifact Tier system was released. Artifacts start at tier 1.0 and tier increases by 1 if you complete its event again. Each artifact's bonus is multiplied by its tier.
|Image||Name||Effect (Base)||Increase Per Level||Released|
|Frowns Mask||+4% Card Yield||+0.25%|| Halloween Event 2018
25 Blue Candies and level 500
|Santa Globe||+4% Gold Yield||+0.25%||Taking Down Santa Event 2018|
|Gold Dragon||+4% Gold Logs||+0.25%|| New Year Event 2019
Spend 4000 Invest Points
|Fish Tastiness||+4% Fish Quality||+0.25%|| Global Warming Event 2019
Reach tier 20
|Clean Energy|| +4% Fish Min Quality|
Also increases the doubling chance by a small amount
|+0.25%|| Clean Energy Event 2019
Complete first playthrough
|Match3 NRG||+4 Fish/Wood/Mine NRG each day (rounded down)||+0.25|| Match 3 Event 2019
Complete the event
|Mafia Madhat||+X% Pet Training||+?|| Mafia Madness Event 2020
Defeat the final boss
The base upgrade cost is 500. The cost of each level increases by this amount. Every ten levels, ten times the increment is added to the cost and the increment increases by 500. The formula for upgrade cost is 500*level*ceiling(level/10).