Lap1976
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Of course, you can finish very early, but, pff, I couldn't - you can only reach the northern right castle by defeating the emerald dragons, and the left one - by defeating phoenixes or elementals. By the time I had enough strength, the enemy came to me, and I had to wander around, wasting a lot of time.
By the way, the save submission period ends today, please unlock the walkthrough thread for this mission.
Ideally, it ended yesterday, as I saw a post from the organizer somewhere - the championship continues until July 7th, inclusive.