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CryptoSolve can used as an application or a game, depending on your perception. CryptoSolve lets you input any text and it cyphers/encrypts it in a way that it can then give you clues how to solve the cryptogram, such as how many real letters there are in the cypher.
You can save, open and print documents also, enabling you to share your cryptogram with other people.
See also the same software released a decade later: Crytogrammer
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CryptoSolve / compressed w/ Stuffit
Mac OS 1.x - Mac OS 6.x
Note: Freezes any system with Mac OS 7 or higher. Tested working fine under Mac OS 6.0.8 in Mini vMac.
Emulating this? It should run fine under: Mini vMac