I--- Thmyl — Lbt Lego Ninjago Tournament Llayfwn

It looks like you’ve written a phrase with a simple letter substitution cipher (likely each letter is shifted by -1 or +1 in the alphabet).

But the most likely intended decoded version: (llayfwn → playfun? l→p? doesn’t fit). i--- thmyl lbt Lego Ninjago Tournament llayfwn

or “I beat the final Lego Ninjago Tournament playthrough” It looks like you’ve written a phrase with