Reaction times are correlated with IQ, but does training reaction times improve IQ? It's hard to imagine it would transfer to other activities. I vaguely remember a study that examined precisely that and came up negative. You might be practicing that particular skill, but I don't think it will make you better at anything else, anything useful (unless you can make a living with the game, which would be useful, I guess).
There were some competing claims about how much you can change IQ. If you really want to change just IQ, on paper, there is some re-testing effect.
Catron, David W., and Claudia C. Thompson. “Test-Retest Gains in WAIS Scores after Four Retest Intervals.” Journal of Clinical Psychology 35, no. 2 (1979): 352–57.
https://doi.org/10.1002/1097-4679(197904)35:2<352::AID-JCLP2270350226>3.0.CO;2-2.
Dikmen, Sureyya S., Robert K. Heaton, Igor Grant, and Nancy R. Temkin. “Test–Retest Reliability and Practice Effects of Expanded Halstead–Reitan Neuropsychological Test Battery.” Journal of the International Neuropsychological Society 5, no. 4 (May 1999): 346–56.
https://doi.org/10.1017/S1355617799544056.
Matarazzo, Ruth G., Arthur N. Wiens, Joseph D. Matarazzo, and Thomas S. Manaugh. “Test-Retest Reliability of the WAIS in a Normal Population.” Journal of Clinical Psychology 29, no. 2 (1973): 194–97.
https://doi.org/10.1002/1097-4679(197304)29:2<194::AID-JCLP2270290212>3.0.CO;2-W.
I don't think any of that will make you more intelligent, though, particularly the more g-loaded an activity is. The more g-loaded an activity, the less effect re-testing had, too.
If you are doing some activity in hopes of being more intelligent to perform better at yet another activity, I would rather just practice the activities you ultimately want to be good at, if I didn't misunderstand.
