Breakdown of shourijouken o kakuninsuru.

Questions & Answers about shourijouken o kakuninsuru.
を marks the direct object of the verb.
Here, the thing being checked/confirmed is 勝利条件, so 勝利条件を確認する means that 勝利条件 is what gets confirmed.
- 勝利条件 = the victory conditions / win conditions
- を = direct object marker
- 確認する = to check / confirm
So the structure is basically:
[object] を [verb]