Core goal: Players who cleared Campaign 30 keep saying the same thing: late levels are not harder math, they are more modules at once, Morse delay, Chaos pulling Blind off the bomb, and Deaf getting overloaded. Custom exists so you do not wait for Campaign to randomly give you the module that is actually killing you. Campaign answers "what should we learn next?" Custom answers "what exactly do we want to test?" Endless answers "how long can we sustain it?"

1What Each Mode Is For

ModeWhat It AnswersWhen to Use It
Campaign (30 levels)What should we learn next?A new module just appeared and you have not named it cleanly yet. Failures are different every bomb. You are still discovering new panels.
Custom (bomb designer)What exactly do we want to test?The same failure survived three bombs. You know which module is breaking. You want to drill one thing without random noise.
EndlessHow long can we sustain it?Only after Campaign procedures already survive. Tests endurance, not learning.

Stay in Campaign or Open Custom?

Stay in Campaign if: A new module just appeared and you have not named it cleanly yet. Failures are different every bomb. You only guessed the last input and the level still cleared (that is a fake clear, do not skip ahead).
Open Custom if the same failure survived three bombs: Cable reaches Blind without a usable left or right position. "Your left or my left?" on Direction. Calculator's second state still uses the first answer. Switch hits Enter with one disputed value. Morse has four digits but one slot is untrusted. Deaf is the bottleneck.
If you cannot say one thing that will be different on the next timer, do not start another Campaign bomb.

2Custom Drills That Transfer to Campaign 30

Do these in order. One module family per session until the callout is boring.

Common Mistakes to Avoid

What Players Who Finished 30 Actually Reported