Synergy bonuses can be applied by combining specific upgrades in 20 Minutes Till Dawn, and many of them have positive and negative effects that players should consider based on their playstyle. Most synergies require two upgrades to create, but arguably the best bonus needs three different upgrades to be acquired. Players can use synergies to increase their chances of surviving the full 20 minutes.
Upgrades in 20 Minutes Till Dawn can affect a variety of stats including HP, reload speed, bullet damage, elemental damage, and other aspects of a character's abilities. The best upgrades to unlock will depend on playstyle and which character is being used. There are over 60 upgrades available, but only a few synergies, so players will need to deliberately focus on obtaining these bonuses rather than trying to passively gain them. Upgrades will become available throughout the run as players kill enemies and gain XP.
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As soon as the first upgrade is available, players should consider what synergy, if any, they want to build. The possible synergies will depend on which skill tree is being worked on and what works best with the character being used in 20 Minutes Till Dawn. There are currently seven synergies that players can take advantage of. More combination perks could be added in future updates, but there has been no official announcement for additional synergies at this time.
Synergy information can be viewed by using the Esc key to open the upgrades menu. The initial display will show any upgrades that have already been unlocked. The synergies button can be used to view details on every possible combination and the effects they have. The upgrades menu can't be opened
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