(Print) Use this randomly generated list as your call list when playing the game. There is no need to say the BINGO column name. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.
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No test data factory or builder
DMLs in loop
SOQLs in loop
Hard-coded ID
Non‑descriptive variable names in Flow
Missing bulk tests in test classes
Excessive lack of .startTest() and .stopTest()
No assertions in Tests
All classes in without sharing mode
No flags to deactivate trigger and validation rules declaratively
Exactly 75% test coverage
Public Read/Write OWDs
SOQLs without WHERE or LIMIT outside Batch
Checking collection emptiness before DML
Hard-coded authentication instead of using Named Credentials
Excessive amount of System.Debug()
Using Profiles instead of Permission Sets
Multiple Record Triggered Flows on same OperationType on one sObject