Choice of your weapons should be based on enemies you are facing and your current ammo.These plates are useful when you want to reach supplies fast or when you are weakened. Explosive barrels can kill nearby demons, and interactive plates can launch you up in the air. Besides supplies and artifacts, you can also find objects that may increase your chance at surviving. Use interactive objects from your environment.Collect them right when a battle starts - this will make the majority of the battles easier to win. increase your damage or make you immortal for a brief moment. You can come across supplies with health and ammo but the most important ones are multicolored artifacts. Always use this chance to explore your surroundings. Starting a fight as fast as possible isn't always the best idea, especially in locations where demons start appearing after you destroy a nest. Every bigger battle in Doom takes place in a large location. The most problematic demons are those that use powerful attacks or those that are difficult to avoid.
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Try to quickly asses which enemies you are fighting against and start with eliminating the most dangerous ones. They majority of the fights put you up against various demons.
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![doom how to use chainsaw doom how to use chainsaw](http://www.doometernalmods.com/wp-content/uploads/2020/06/Chainsaw-upgraded.png)
The game doesn't have any achievements related to difficulty levels - you won't lose anything if you switch your current difficulty. Set your difficulty level to a lower one if, despite numerous attempts, you aren't able to beat a certain part. This is especially useful during the aforementioned boss fights. You can change your difficulty level at any point of the game.These battles require you to learn a boss' attacks and know how to dodge them.
![doom how to use chainsaw doom how to use chainsaw](https://guides.gamepressure.com/doom-eternal/gfx/word/536997578.jpg)
The only fights that are more difficult are those where you have to face bosses. This difficulty still requires you to learn the basic gameplay mechanics, to move around a battlefield and to choose weapons that are most suitable for a given fight but you won't have to repeat the same parts over and over again. You will be able to complete all the missions without any serious problems. This is an optimal difficulty level for your first playthrough.