Hi!
@ristovski figured I should make a separate thread for tptnet code challenges. For those interested, TPTnet is making some sort of limited release which means that registration is only allowed based on "Early Register Codes".
I have a bunch and am making puzzles and contraptions with the keys tucked inside to give people incentives to be creative and test their puzzle solving skills.

I've duplicated all the challenges posted on the TPTNet thread here as a result:

Challenge 1

http://tpt.io/.286137
Audio file: http://static.boxmein.net/erc/1095759f67396bb5c97f2d34e7f3de0b.ogg
Hover for the solution

Challenge 2

http://tpt.io/.286266
Picture file: http://static.boxmein.net/erc/269b083fad782872dad13f96da698854.png
Hover for the solution

Challenge 3: Key 3, Key 4

http://tpt.io/.286724
Lossless audio: http://static.boxmein.net/erc/3f683e11b67ee77378c4c2ca6c910cfc.flac
Two keys - unsolved!
Hint for the first key: It's literally text to speech :D
Hint for the second key:

ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789-#######-##-#####-###

Ristovski Extra: Key 5

http://tpt.io/.286744
Audio: http://static.boxmein.net/erc/4cc9d5e7525e2ff54414940fbf05c9d8.mp3
One key - unsolved!
Hint 1:

UKW-B,I,II,III,13/M,03/C/11/K: ZVNHUCVCR = MUDBU EMSZYCR, OVGSD = .JSB.ADQZV

Hint 2: Image https://i.imgur.com/66Wp9Y7.jpg

Challenge 4: Key 6

http://tpt.io/.286755

Hover for solution

Challenge 5: Key 7

http://tpt.io/.287058
Plain text:

RCHMX49z0EzCM2YAzDB3

Hint 1: z = -
Hint 2: ',.pyfgcrl = qwertyuiop
Hover for solution

belugawhale Extra: Key 8

http://tpt.io/.287119
Image: https://www.dropbox.com/s/w8gtlngfvzlab6x/ERC%20Challenge.png?dl=0
Solution: http://tpt.io/.287241
Hint 1: (Stage 1) You will need the actual file to work with. To download files, change the "dl=0" to "dl=1" at the end of the url.
Hint 2: (Stage 2) Each column is one character.

Mrprocom Extra: Key 9

http://tpt.io/.287121
Image: http://i.imgur.com/ipPLz6D.png
Text:

[MjY=]{D#(1st-top)}{C(2nd-mid)}{C(2nd-top)}[NA==]{F#(1st-bottom)}[REFTSA==]{D#(1st-top)}{B(1st-bottom)}[REFTSA==][Mw==][REVDT0RFIE53PT0=]{F#(1st-bottom)}{G(1st-bottom)}{F#(1st-top)}[REFTSA==]{B(1st-bottom)}{F#(1st-top)}[NA==]

Hint 1: Base64
Hint 2:

{Pno(First/Second-Bottom/middle/top)}

Hint 3: Image
Hint 4: Example: (All: 1st(except for fifth key in this case)-bottom) C-B-N-M-,-M-N-G-X-C-G-B-G-C-D-S-D-C-C-C

CeeJayBee Extra: Key 10

HTML: http://statudrutr.wix.com/robot36
Hint 1: http://tpt.io/.287244

greymatter Extra: Key 11

http://tpt.io/.287243
Text:

JRPZMT-9Z-XS4OV-7TG

Image:
Hint 1: http://s4.postimg.org/epjgpax99/clue.jpg
Hint 2: http://s22.postimg.org/ro9kpbp1d/clue2.jpg

Surprise io Extra: Key 12

ZIP: https://www.dropbox.com/s/s7xwub7va59x94z/ERC.zip?dl=0

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Upcoming challenges - @ristovski extra extra!
That's basically it for now, but keep your eyeballs on this thread for fresh keys and updates on challenges!

@belugawhale (View Post)
Sure, just get on IRC and we'll discuss the idea - I've given out two already to people who wanted to make puzzles :)