This is the 7751st most frequent Russian word.
игу
The word "игу" does not appear to have a meaning in standard Russian; it may be a typo or non-standard usage.
In this sentence, "игру" is the accusative case of the word "игра," meaning "game."
Я вижу игру на горизонте.
I see a game on the horizon.
Here, "игру" is used to describe the action or type of game being started.
Дети начали разноцветную игру на площадке.
The children began a colorful game on the playground.
In this case, "игры" is the genitive case of "игра," which denotes ownership or association to the rules.