Hero Defense is a tower defense game, that quickly runs out of tower defense maps and morphs for players into arena battles. In arena battles heroes are pitted against one another to achieve better rank. Better rank gives better rewards. However holding high positions is also very difficult because of the exponential increase in cost of increasing weapons and equipment levels.
The game has fairly good balance, and high ranks can be achieved even for those who do not put money into the game. But as mentioned before because upgrades slow to a hault, and would become very costly if paying many players who make it to the top of the leader board become bored and leave, also helping to balance the game for long term (non-paying) players.
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