Even though economic games are frequently used to examine cooperation, the comprehension of these games is an unexplored area. This thesis examined comprehension of five common economic games, the Dictator game, the Ultimatum game, the Trust game, the Prisoner’s dilemma, and the Public goods game, in a pre-registered study and reported comprehension from two online labor markets, Prolific and CloudResearch. Participants played each of the five games and answered accompanying comprehension questions after. Half participants were incentivized to answer the questions correctly. The study concluded with the participants answering seven numeracy questions and demographic questions. The results showed that comprehension differed between games and none of the games had full comprehension from the participants, ranging between 26% of participants comprehending a game to 72%. Logistic regressions for each game showed that higher numerical ability predicted higher probability of comprehension. In three of the games decreased the probability of comprehension if the participants were from Prolific. Incentivized comprehension questions only increased the probability of comprehension in one game. The logistic regression model of full comprehension of all games was affected significantly of labor market, incentivized comprehension questions, and numeracy. The study’s results demonstrate that comprehension needs to be further examined and research of what affects comprehension needs to be conducted. Also, comprehension’s effect on participants behavior in economic games needs to be investigated in detail.