やり込こみ

noun

self-imposed challenge; completionist play

Video game term for playing beyond normal completion, such as speedruns, 100% completion, or no-damage runs. Often used in phrases like やり込み要素 (completionist elements) or やり込みプレイ (challenge play).

• このゲームはやり込こみ要よう素そが豊ほう富ふで、何なん百びゃく時じ間かんも遊あそべる。

  This game has a lot of completionist elements, so you can play it for hundreds of hours.

• 彼かれのやり込こみプレイはすごい。ノーダメージでラスボスを倒たおした。

  His challenge play is amazing. He beat the final boss without taking any damage.