Did someone had exerience when miniclip had bitcoins as value on their website. It was like years ago but back then I had some bitcoins made by playing games. Is there any possibility to come back those coins or something?
So you had bitcoins on a website. Well, that was in
their wallet (no private key for you).
If that's no longer available I'm afraid that the chances for you to get those coins is slim (I should say 0).
However, this is not an issue with Bitcoin, it's an issue with Miniclip itself, so the only ones who could help is
them (i.e. allow you withdraw those coins to your wallet).
Now think it over: what would be the reason they would give you now valuable money you didn't claim when you had the occasion?
If you think you have a chance, ask their support.