enigmatic puzzle – I am unable to determine this cipher with random alphanumeric characters. What sort of cipher is that this?

My good friend despatched me a cipher with 3 elements (with out telling me the way to separate the elements. He encrypted every half differently, then the entire thing was encrypted once more. He says that half 2 is longer than half 3, which in flip is longer than half 1, so 2>3>1. It’s in base 10 and it would not make sense in another bases anyway. It ought to largely be in English however the final half is a poem, maybe in German. Weirdly, he additionally offered this poem from Prepared Participant One by Ernest Cline:

"Three hidden keys open three secret gates

Whereby the errant might be examined for worthy traits 

And people with the ability to outlive these straits 

Will attain The Finish the place the prize awaits"

-Ernest Cline, Prepared Participant One

I do not know the way to resolve it as a result of the textual content has seemingly random jumbles of alphanumeric characters. Right here it’s:

W3CWLI186N66NE6G9E6E76LLA31R7WRH5F1A7WR3WTETDO3B36T6RA3606RR6O6I9V86NW6F7W1A1FOH9TADUVIDUOIV7VME66DWE6AMWSSODDPSUBHADU2EAIE8WLDV7BWPVIEVMWVIW9WD9SW7LDYPWYVDJDY2E2DYW9WYJWBVUL7DLW6VERS76I5U6V7BW7L6UYWPD2W6V7BVYELCU7S7VA9YD2DVWBD22DLPWJWLBWELP6WBUYWBD22DL9YD69WY7VAJDYVIW6EHWDJDUYJUVUYW6ELPJDYW8WY67OLWPOWDYOWME6I7LOVDLONIRFWAN6W12NAGFRCTOTOPAN6S1A156OU6GU6G2FFPH3SLAN6RW6OSNW6DFH3A1FOTOPTHHANTAAN6W61GOFG3SNW1PPH6H1L6LWUBAFGTAAN6S1TGFUF3PFOAFTD6AF4N3WO6UAFAN66OPPFRAN6IFWHPFW2FPRFWX1PAN63GTAFR1OPGNC6AN1O21RUF3I6OAAN1GRTWTOPTW6G661O2AN1GC6GGT26AN6OSFO2WTA3HTA1FOGUF3NTD6GFHD6PAN6XW6OB13GS1BN66G12O6PX66OB13G

I managed to search out some patterns in letter location, comparable to V solely showing within the first half, X solely showing on the finish, Y solely showing within the center, no Z in the whole textual content and many others. I imagine this can be some kind of pc encryption, but I can not consider any methodology in base 10 that might have random alphanumeric characters. What sort of cipher is that this, and the way can I resolve it?

Edit: The poem might be not that associated. I imagine my good friend used some kind of cipher much like pc encryption, however nonetheless human-solvable (probably with the assistance of on-line instruments, however not requiring an precise program to be written)