This algorithm is one of the essential OLL cases. It helps you orient the last layer more efficiently.
About This Case：
OLL21 is a full-brightness pattern where most of the top is yellow, forming a plus-shaped arrangement.
Recognition：
A bright yellow plus shape with only the corners missing.
Memory Hint：
Identify the plus first, then check which corners remain unlit.
Execution Tips：
Break the algorithm into common triggers like Sune and Anti-Sune.
OLL21 is a full-brightness pattern where most of the top is yellow, forming a plus-shaped arrangement.
Recognition：
A bright yellow plus shape with only the corners missing.
Memory Hint：
Identify the plus first, then check which corners remain unlit.
Execution Tips：
Break the algorithm into common triggers like Sune and Anti-Sune.
