In spider-splatting simulator Kill It With Fire, you are not offered a list of all the level objectives at the start of a level, so it can lead to backtracking and random attempts to find where the final pieces of an objective are. However, the best way to approach the game is not to react precisely how one would in the situation that your home was being invaded by spiders. Instead, initially ignoring the spiders, taking your time is often the best approach.
However, some objectives are not in plain sight and require a little more investigation.
Take the Secret Room in the game’s second level, Close Encounters. After gaining access to the Study, achieved by killing 15 spiders, you will find a desk with a computer, some chairs, and bookcases. On the floor to the left of the desk, you will find a paper that you can interact with by pressing E adding the objective to the clipboard, and this will task you with finding the secret room.
This could lead you on a wild goose chase as there are a few crannies that it could conceivably be. However, you don’t need to look very far.
Directly behind you, on the wall opposite the desk, is a bookcase. You can interact with only the blue book with a yellow spine, located on the second shelf, and is the second book in from the right.
Press E on this book, and like all good evil secret lairs, the book will trigger the bookcase to move to the left, revealing a little room that contains all manner of goodies and completes the objective on your checklist.
This handy room includes batteries which need to be collected from the level, the safe which contains the C4 weapon and can be unlocked after completing four of the level’s objectives and adds to the progress of the level’s equipment, as well as the boombox that allows you to start the Arachno-Gauntlet challenge.