(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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Using Profiles instead of Permission Sets
Missing bulk tests in test classes
Multiple triggers on one sObject
Excessive lack of .startTest() and .stopTest()
Multiple Record Triggered Flows on same OperationType on one sObject
Getting IDs by loop instead of Map(records)
Hard-coded ID
All classes in without sharing mode
Exactly 75% test coverage
SOQLs without WHERE or LIMIT outside Batch
No test data factory or builder
Only catching general Exception in try-catch
SOQLs in loop
Hard-coded authentication instead of using Named Credentials
Non‑descriptive variable names in Flow
Code in trigger instead of Trigger Handler
Checking collection emptiness before DML
Gigantic Flow instead of multiple Subflows
DMLs in loop
No assertions in Tests
No flags to deactivate trigger and validation rules declaratively
