For second language instructors, ESL games and linguistic outcomes go together like bread and butter. ESL games are a fantastic way for instructors to reach different learning intelligences by incorporating visual, kinesthetic, and musical strategies into the classroom. Games are also a fabulous way to develop the intrinsic motivation in students that second language acquisition requires.

The theory of multiple intelligence is based on the idea that we all learn differently. The organization Literacy Works has identified eight intelligences: language (linguistic), spatial, logic/math, body movement (kinesthetic), musical, social, (interpersonal), self (intrapersonal), and nature (naturalist). Depending on their intelligence type, students engage with the act of learning in different ways. ESL games are an excellent way to tap into the many different intelligence types that exist in the ESL classroom.
Creating intrinsic motivation in students is a critically important component of successful ESL instruction. The theory of intrinsic motivation is based on the notion that students need to be driven by internal needs or desires to efficiently and effectively learn a new language. Because of the complex nature of second language acquisition, intrinsic motivation for students in the ESL classroom is of paramount importance.
The most successful way humans acquire a second language is through immersion. When people are in an environment where the only way for them to meet their basic living needs (getting directions, buying food, arranging shelter, etc.) is by speaking a non-native language, a natural exigency is present in them to learn how to communicate in that language. There is a real-world need that speaks to the instinctive part of the human brain that is concerned with survival. This need fuels second language acquisition more successfully than any other motivation.
Creating this type of real-world need in the ESL classroom is neither practical nor ethical. What must replace it is in intrinsic motivation driven by the student's desire to learn the second language. For students, the ESL classroom is often hard to distinguish from the larger totality of the academic experience. Learning English, for many students, is no more desirable a pursuit than learning calculus or social studies or economics.
ESL games and linguistic outcomes that they produce are a fantastic way to facilitate intrinsic motivation in students. The only difference between a game and a quiz, in many respects, is the negative association students have towards the concept of the quiz. Games, however, connote a different meaning. Games are fun. When students are actively engaged in activities that they enjoy, they have a natural, intrinsic motivation to master the task, to win the game, and to achieve the intended linguistic outcomes the game is designed to address. In this way, games are a natural way to bypass the apathy in students that is crippling to second language acquisition and to generate a natural, enthusiastic, exigency for learning.
Make sure that all games you introduce have clear linguistic outcomes. If students clearly understand what they are expected to accomplish when playing a game, a healthy and productive level of competition naturally develops in the classroom.