840,527,321,220,386 layers, safe
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Final output: Game Over!
That escalated quickly.
Solution
Safe despite some valiant efforts (particular credit to @Sisyphus and @DomHastings). It's now clear I could have got away with using only two languages instead of four!
You probably don't have time to run every layer so here are the first seven and last seven. Note that version-dependent Ruby code is used so both links will likely break if/when TIO's Ruby is updated.
Layer 1: PHP
Just a (cheating) quine. The purpose of this 'invisible' layer is to mask the simple alternating pattern of Layers 3–840,527,321,220,386 by giving the false impression that after Layer 2, an odd number of layers remain.
Layer 2: Malbolge
This layer, created using this generator, was a last-minute addition. It serves two purposes:
1. Obfuscation. Layer 3 is easy to crack even without knowing the language (as noted in @Dion's comment). I wanted some protection against this first-glance weakness.
2. Red herring. A cracker stuck at Layer 4 (missing the -rprime
flag) might wrongly guess that there is code in another language hidden in Layer 2.
Layers 3, 5, 7, ..., 840,527,321,220,385: bitch -c
The bitch layers don't do any real work; they simply spit out the next Ruby layer. The (implementation-specific) -c
flag activates character I/O. I chose bitch for its simple ASCII-code-based character I/O and because it is relatively unknown/unpopular on CGCC (only used in four previous answers).
Layers 4, 6, 8, ..., 840,527,321,220,386: Ruby 2.5.5 -rprime
The Ruby layers rely on obfuscation, the nasty version-dependent practice of calling methods by index, and the even nastier 'feature' that the default method indexing is disrupted by loading certain libraries via the -r
flag. Specifically, the -rprime
flag (which loads the Prime
library) alters the methods
array for objects of Integer
type, inserting :prime_division
and :prime?
at indices 20 and 21, respectively. Thus, by including calls by index to Integer
methods with index greater than 19, the code is made to break if executed without -rprime
.
The code works as follows. The hex integer 0x5f40c10f01b74eafa17c9
is \$7197109101327911810111433\$ in decimal, which is the ASCII codes of Game Over!
concatenated. The prime factorisation of this integer is \$3^2\times29\times173\times347\times1093\times420263660610191\$. Each of these prime factors, except the last, appears in the first line of Layer 4 (\$3\$ and \$1093\$ are expressed in hex; this is a red herring). Call the last integer in the first line \$n\$, so \$n=0\$ in Layer 4. The code tests whether \$3^2\times29\times173\times347\times1093\times{}n=7197109101327911810111433\$. If so (as occurs only when \$n=420263660610191\$), the integer is broken into an array of ASCII codes (basically via 7197109101327911810111433.to_s.scan(/1?../)
in de-obfuscated form), converted to characters, and printed. If not (as occurs for all \$n<420263660610191\$), the code prints itself, with \$n\$ incremented by 1, as a bitch program. This program is simply a string of ASCII codes sandwiched between #
and /
characters.
Why -rprime
?
No methods provided by the Prime
library are actually used (the prime factorisation was done separately), so why -rprime
? The original plan was not to increment \$n\$ by 1 at each iteration, but rather to replace it by the next higher prime. This would have added another level of frustration to any cracker who stumbled on the -rprime
flag because the required execution time would have gone through the roof. I gave up on this approach because I was unable to calculate the required number of iterations (i.e. the number of primes \$\le420263660610191\$) in reasonable time!