On the Subject of Zero-Resistance

Knock on my door and who knows, maybe I’ll open up to you.

• Initially, there will be the number 128 written on the module.
• Your friend is mentally suffering. You can help them by being close to them.

Stage I. Getting inside

• At first, you have to get inside their room. Their door is probably locked from inside, so you have to convince them to open the door.
• To knock, press the center of the module. Every knock will halve the number on the module.
• After every knock, a random number between 1 and the number on the module is chosen. If this random number is equal to 1, then the module’s number will turn green, meaning that the door is unlocked. If the number is green, press the status light and see section “Stage II”.
• If you knock at the wrong time, the number on the module will double and the module will strike.
• If after the first knock the number turned yellow, see section “Stage I.1”.

Number on the module	Press condition
128	Anytime.
64	When the last seconds digit of the timer is equal to the last digit of Serial Number (SN).
32	When only one of the seconds digits is prime.
16	When the concatenation of the minutes digits* and the seconds digits is a palindrome number**.
8	When the seconds digits are equal to product of ((sum of SN digits) and number of batteries) modulo 60.
4	When the total time (in seconds) is divisible by the sum of alphabetical positions of SN letters.
2	When the concatenation of minutes digits* and seconds digits is a prime number.

*The timer will be considered in HH:MM:SS format. If your timer is in MMM:SS format, just take the number of minutes modulo 60 to get the minutes digits.
**Drop leading zeroes. For example, 05:50 will not work, 05:45 will work.

Stage I.1. Alternate state.

• If the number is yellow, then the room is initially unlocked, but your friend is sleeping.
• To get through this stage, use the table below.
• Be aware: in this state, the number will never turn green without any strikes.
• If you do something wrong, you’ll wake up your friend, taking you back to Stage I with the number 128 on the module. Also the module will strike in that case.

Number on the module	Action
64	Press the module when the last seconds digit of the timer is equal to the last digit of the SN.
32	Press the status light when the seconds digits of the timer are 00.
?	Press the module when only one of the seconds digits is prime.

Stage II. Being close.

• It'll take time to take the weight off of their chest. Try to stay close despite their crash out. After getting through the first stage, a timer will appear. From this moment, the module can’t strike, so you’re safe.

Condition	Initial time on the timer
Didn’t reach the alternate state.	30.0 + 7.5 for every strike on this module.
Went through the alternate state without striking on it.	60.0.
Struck on the alternate state.	90.0 + 10.0 for every strike on this module, except first one.

• Highlighting the module will decrease the time, not highlighting the module will lead to the time increasing.
• When the timer reaches 0.0, it will freeze. Pressing the status light will now solve the module.