Brain Age' video game was effective at doing what it claims to do. It compared training with Brain Age to Tetris.
Apparently, brain- age training impacted just about everything better than the Tetris control. As can be seen in the table above, errors went down by about 2.4; while Tetris training only improved errors by .4 units.
The paper is available at:
Nouchi, R., Taki, Y., Takeuchi, H., Hashizume, H., Nozawa, T., Kambara, T., … Kawashima, R. (2013). Brain Training Game Boosts Executive Functions, Working Memory and Processing Speed in the Young Adults: A Randomized Controlled Trial. PLoS ONE, 8(2), e55518. doi:10.1371/journal.pone.0055518