Currently making the solution for Guess My Cheese (Part 2)and the walkthrough will be published here as soon as it's ready.
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A custom cipher reminiscent of AES. Reverse engineer the S-box and cipher operations to decrypt the flag.
RSA with more than two prime factors. Factor N using a multi-prime factorization tool, then compute phi and decrypt.
A flag encrypted using LFSR-derived AES key. Recover the 128-bit LFSR key sequence, build the AES key, and decrypt the flag in ECB mode.
A lattice-based cryptosystem. Use a lattice attack to compute the private key from the public information and decrypt the flag.
Two RSA encryptions of related messages (same key, minor difference). Apply the Franklin-Reiter related-message attack to recover the flag.