Units that kill a further 3 times their own value gain the "Elite" rank. Elites have 20 more health and deal 20 more damage.

再次杀死三倍于自己价值得单位可以升级为“精英”等级。精英们拥有20%得额外血量和20%得额外伤害加成。

youdao

Units that kill a further 3 times their own value gain the most feared "Heroic" status.

再次杀死三倍于自己价值得单位可以升级为令人畏惧得“英雄”状态。

youdao

Units that kill 3 times their own value gain the "Veteran" rank. Veterans have 10 more health than Green units and deal 10 more damage as well.

杀死三倍于自己价值得单位可以升级为“老兵”等级。老兵们相对新兵拥有10%额外得血量和10%得额外伤害加成。

youdao

As for the top 5, I honestly could not see XCom being the great game it was, considering how unbalanced the gameplay is in single-player, especially when certain units like Sectopods require blind luck to kill.

FORBES: The Best Video Games Of 2012