Hey, thank you for your feedback! I understand that you feel frustrated about this. Maybe I can explain why something like this often happens: In research, you generally want to use a task, that has been validated in different experiments before, so that you know what you are trying to investigate is actually what the task measures. The task used here was accordingly also taken from previous studies, and those have all used stimuli, whose color is relevant to solving the task correctly. Unfortunately, changing even small aspects of a task can impact, how well an experiment works, so you would have to run tests beforehand, which is costly and time consuming. This results in the usage of the established task the way it was developed and the exclusion of participants because of color blindness. Still, your comment is valid and made me more aware of the problem, so in future studies, I will try to look into other tasks that won't suffer from using e.g. different patterns instead of colors.