Rinzai Zen is a school of Zen Buddhism that originated in China and was later brought to Japan by the monk Eisai. It is known for its emphasis on koan practice and sudden awakening, which sets it apart from other forms of Zen.

One of the main differences between Rinzai Zen and other forms of Zen is its focus on koan practice. Koans are paradoxical statements or questions that are used to challenge the student's rational thinking and lead them to a state of sudden awakening. This practice is unique to Rinzai Zen and is seen as a direct path to enlightenment.

In contrast, other forms of Zen, such as Soto Zen, place more emphasis on meditation and mindfulness as a means of achieving enlightenment. While these practices are also important in Rinzai Zen, they are seen as a means to prepare the mind for koan practice.

Another difference is the emphasis on sudden awakening in Rinzai Zen. This means that enlightenment is not seen as a gradual process, but rather a sudden and direct experience. This concept is based on the idea that our true nature is already present within us and can be realized in an instant through the practice of koans.

Other forms of Zen, on the other hand, may view enlightenment as a gradual process that requires dedicated practice over a long period of time. This difference in perspective can be seen in the teaching styles of Rinzai Zen masters, who are known for their direct and sometimes confrontational approach in guiding students towards sudden awakening.

Additionally, Rinzai Zen places a strong emphasis on the role of the teacher or master in the student's spiritual journey. In other forms of Zen, the emphasis may be more on self-discovery and self-guidance. In Rinzai Zen, the teacher is seen as a crucial guide who can help the student navigate the complexities of koan practice and ultimately achieve sudden awakening.

In conclusion, Rinzai Zen differs from other forms of Zen in its emphasis on koan practice and sudden awakening, the role of the teacher, and its unique teaching style. This school of Zen offers a direct and challenging path to enlightenment, which has attracted many practitioners seeking a more intense and transformative spiritual experience.