After the subcutaneous injection was explained to the experimental group, the digital game developed for subcutaneous injection was explained and they were allowed to play the game for a week. Afterwards, the experimental group was shown the subcutaneous injection application on a low-reality model of the abdomen, and the students were allowed to practice the skill.

The students in the control group were given the traditional education method (subcutaneous injection application on a low-reality abdominal model after the completion of the theoretical course on the subject of subcutaneous injection).

The subcutaneous injection practice game was developed to examine nursing students' injection practice skills and its effect on their satisfaction with learning.

The level of knowledge about subcutaneous injection was measured by the "Subcutaneous Injection Knowledge Test", which was prepared by the researchers in line with the literature and submitted to expert opinion and whose Content Validity was calculated. The subcutaneous injection knowledge test is a multiple choice test consisting of 25 questions. The scores obtained from the test will not be classified according to the level of achievement, the averages of the achievement scores of the groups were compared.

Subcutaneous injection skill level was measured with the "Subcutaneous Heparin Injection Administration Skill Checklist", which was prepared by the researchers in line with the literature and submitted to expert opinion and whose Content Validity was calculated. There are 33 items in the Subcutaneous Heparin Injection Administration Skill Checklist. Each item consists of three points as "adequate", "developmental" and "inadequate", respectively. The scores of these degrees are "2", "1", "0", respectively. The highest score that can be obtained from the test is "66" and the lowest score is "0".

Students' satisfaction and self-confidence levels were measured with the Turkish validity and reliability study "Learning Satisfaction and Confidence in Learning Scale". The scale consists of "13" items and the 13th item of the scale is reverse coded. Each item was scored on a five-point Likert scale between "strongly disagree-strongly agree". The lowest score that can be obtained from the scale is 13, and the highest score is 65.

The level of knowledge about subcutaneous injection was measured by the "Subcutaneous Injection Knowledge Test", which was prepared by the researchers in accordance with the literature and presented to the expert opinion and whose Content Validity was calculated. The subcutaneous injection knowledge test is a multiple choice test consisting of 25 questions. The post-test was administered to both groups 2 weeks after all the interventions. The scores obtained from the test will not be classified according to the level of success, the averages of the groups' achievement scores will be compared.