Be sure to keep an eye on your map - your map is constantly updated whenever you spot something (ammo, health items, etc.), making it easy to keep track of the little collectible items in each room.
Flash grenades can instantly kill special enemies - enemies are more robust and grow tentacles that replace the host’s head, thus increasing their attack range and helping them deal more damage. However, they can be killed instantly with flash grenades.
Avoid traps by keeping an eye on the ground - there are a variety of traps, from bear traps to laser trip mines. For bear traps, you can swipe your knife near them or send ammo to trigger them shut. For tripwire mines, you can walk to them to defuse them.
Upgrade your weapons to make the shooting gallery easier - upgrading your weapons also affects the guns in the shooting gallery. Thus, you can hit more targets in the shooting gallery missions, as you don’t need to reload.
Use melee attacks whenever possible - this helps to conserve ammo. It also helps when you fight off several enemies at once to deal damage to everyone surrounding you.
Your strongest weapon is your combat knife - upgrade and repair your knife regularly, as it is your most reliable weapon. It is an excellent defensive tool that you can use against enemy attacks such as chainsaws or thrown axes.
The rocket launcher can be used against tough bosses - most bosses and enemies can be defeated in a single blast.
