Detailed Instructions: You are given a sentence in Japanese. Your job is to translate the Japanese sentence into Spanish.
Problem:私たちはプレイヤーが箱を開けたとき彼らを惹きつけかつ進展のあるように必ず毎回何かしら小さな報酬を設定します
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Y lo que nos aseguramos es que cada vez que se abre una caja haya algo dentro, una pequeña recompensa, eso mantiene a la gente progresando y motivada.