Left 4 Dead 2 - Kink's Puzzles
360:00 Valves puzzle - The goal of the puzzle is to raise the water level to a value of 5, drop it to 2 and raise it to 5 again. This was stated on the clue under the meter with the clue 'fingers of my hand (5 fingers on each hand), my hands (2 hands), fingers on my other hand (5 fingers on other hand). The valves control the water level. Each valve corresponds to a value depending on its size and colour. Red indicates that it raises the water level while blue lowers it. A small value has a value of 1, medium at 2 and large has a value of 3. Hence, a medium blue valve has an effect of -2 on the water level. The 12 valves (ignoring the PURGE valves) are grouped in threes. Each group will only affect the water level once the large valve is used. The yellow dot of each valve indicates if it is active or not, if it is up it does not affect the water level while down means its value will affect the water level. The paper states that the 6th valve (the large blue one) is broken, hence valves 4,5 and 6 are useless.
The first step is to deactivate all the valves by turning all the yellow dots up. To complete the puzzle you have to first find the group with a small red valve and a large red valve and activate the small valve followed by the big valve ( 1 + 1 + 3 = 5 ) to raise the water level to 5. Then, simply turn the other large blue valve that is not broken ( 5 - 3 = 2 ) to lower it back down to 2. Finally, turn the other large red valve ( 2 + 3 = 5 ) to raise the level back to 5. The bridge will be available once complete.
3:33 Directions puzzle - The challenge of this puzzle is to move a box using buttons which control a specific direction. To complete this, you have to first figure out which button corresponds to which direction, and move the box out of the way. It has to move forwards once, right twice and backwards once.
5:40 Explosion puzzle - This requires you to mathematically come up with the best combination of Oxygen and Propane Tanks to blow up the doors. Each explosive (Barrel/Oxygen Tank/Propane Tank) has an X and Y value. As stated in the graffiti, 'X' represents explosive strength while 'Y' represents smoke/fire from the explosion. It also states that 'X ＜ 14' and 'Y ＜ 5'. An X value of 14 or more will incapacitate the whole team while a low X value will make the weapon area unreachable. The best combination is 4 Oxygen Tanks and 2 Propane Tanks with the addition of the 3 Barrels.
7:07 Electric puzzle - You have to choose 3 discs with stripes on them. You have to get the arrow to be pointing at the green zone on the meter. To do this, the number of stripes and the order has to result in a value of 7. The number of the first two discs are MULTIPLIED while the third disc is SUBTRACTED. Hence, possible combinations are 4 x 2 - 1 (or 2 x 4 - 1) and 3 x 3 - 2.
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