A numbers game refers to a situation in which the most crucial factor is the amount or the count.
e.g. Dating is not a numbers game!
A mug's game refers to a profitless or useless activity.
e.g. Eason finally realises gambling is nothing but a mug's game!
Endgame refers to the last stage of a deal or process.
e.g. An endgame can never be reached between the two countries unless they initiate a negotiation.
crucial (adj) 決定性的
profitless (adj) 無利益的
initiate (v) 發起
[Smarties' Power English 第284期]