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1) The artifact duplication bug was fun, and it went unpunished :D
2) The bug where leveled-up skills disappear – I played for 5 hours, went to sleep, woke up, logged in, and... BAM! Where are my skills??!!
3) The troop duplication bug – no comment (works in tactical mode)
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but it depends on how you look at it; if you need a game for PLAYING, then it's okay (the second bug doesn't count)