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I was playing a game (Yu-Gi-Oh) until I found this:
これといった用があって来たわけじゃない.
This was in the very beginning of the game, when someone woke me up. I'm not sure what 「これといった」 and 「わけじゃない」 mean. May someone help me, explaining the sentence? Thank you very much!
This would have been a much better question had you shown your own translation attempt. The sentence indeed contains a couple of very useful words and phrases.
「これといった[用]{よう}があって[来]{き}たわけじゃない。」
「これといった」 = 「これと[言]{い}った」 ≠ 「これと[行]{い}った」
As a way to understand this phrase, try "rewriting" it in your head to 『これ！』と言った, which would roughly mean "saying 'This is it!'".
Since 「これといった」 is always used in conjunction with a negative expression containing 「ない」, the basic idea of a phrase/sentence containing 「これといった」 would automatically be something like "there is nothing one could point one's finger and say 'This is it!'
A wordy explanation, I know, but you will keep encountering this quotative 「と」 for as long as you study Japanese. Informally, it is 「って」 (and I am sure you keep hearing that).
Moving on to 「～～わけじゃない」, it means "It is not the case that ~~" , "I do not mean to ~~"
「これという用があって来たわけじゃない。」, therefore, means:
"It is not that I came here for any particular (or 'important') errand."
