Researchers have suggested that video games can be used to measure cognitive abilities (e.g., Boot, 2015). To that end, we wanted to test the feasibility of developing a measure of fluid intelligence within a commercially-available video game. We created a 15 chamber (i.e., problems to be solved) test called the “Portal 2 Test Battery” using the Puzzle Creator within the popular problem-solving video game Portal 2. In study 1, 35 video game players (VGPs) who had experience playing Portal 2 completed this test and Ravens Advanced Progressive Matrices (RAPM), a validated measure of fluid intelligence, revealing a strong relationship (r=.65) between the two. In study 2, 100 participants, both VGPs and non-video game players (nVGPs) completed the Portal 2 Test Battery, RAPM, and the Bochumer Matrices Test (BOMAT), another validated measure of fluid intelligence. Structure equation modeling revealed a strong relationship between the latent variables fluid intelligence and portal ability (r=.78). Additionally, the reliability of our test was acceptable in both studies (α=.80 and α=.76). These results provide the first evidence that it may be feasible to create a measure of fluid intelligence using the Puzzle Creator within Portal 2.