This article strives to investigate the importance of instructions when using an entertainment game for language learning, and evaluate how instructions affect learning outcome and motivation. To narrow down the case study only one game and language was chosen, namely the popular entertainment game ‘Sly Cooper: Thieves in Time’ (Sanzaru Games, 2013) in Dutch. Eighteen test subjects were split into three groups, one group got no prior instructions to playing, one got basic instructions and the last got thorough instructions. They then played part of the game to afterwards answer questions regarding motivation and take a language test containing words and phrases from the game. The study showed a significant increase in language learning correlated to the increase of instructions, meanwhile also presenting a significant result indicating that instructions might have a positive effect on motivation when using ‘Sly Cooper: Thieves in Time’ to teach language.