(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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Only catching general Exception in try-catch
Excessive lack of .startTest() and .stopTest()
No flags to deactivate trigger and validation rules declaratively
Exactly 75% test coverage
Code in trigger instead of Trigger Handler
DMLs in loop
No assertions in Tests
SOQLs without WHERE or LIMIT outside Batch
Public Read/Write OWDs
Excessive amount of System.Debug()
Non‑descriptive variable names in Flow
Missing bulk tests in test classes
Multiple triggers on one sObject
Gigantic Flow instead of multiple Subflows
Hard-coded authentication instead of using Named Credentials
SOQLs in loop
Multiple Record Triggered Flows on same OperationType on one sObject