capturetheflag (re)

We were given a sb3 file for this challenge. A quick online search shows that this is a MIT Scratch project file. Cool.

Head over to the Scratch editor and load the sb3 file given.

In the code above, we see that each time we click on the flag sprite, the flag will be appended with the new character. Translating this to Python gives:

score = 0
aaa = "gdddbd0w2a3819y3d2390mcb}143748cb70{70"
flag = []
for i in range(len(aaa)):
    flag += aaa[(score % 38)]
    score += 1337

print(''.join(flag))

But after running it, I get gwym7{b831bd23c47d1947dadb8009030d32}c as the output. It looks random, but also kinda looks like a flag. Turns out I need to swap the positions of each 2 characters.

score = 0
aaa = "gdddbd0w2a3819y3d2390mcb}143748cb70{70"
flag = []
for i in range(len(aaa)):
    flag += aaa[(score % 38)]
    score += 1337
    if i % 2 == 1:
        flag[-2], flag[-1] = flag[-1], flag[-2]
        print(''.join(flag))
# wgmy{78b13db324cd79174adbd089030d023c}