(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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Code in trigger instead of Trigger Handler
Excessive amount of System.Debug()
Excessive lack of .startTest() and .stopTest()
No Test data factory/builder
Hard-coded authentication instead of using Named Credentail
Calling Queueable in loop without control mechanism or logging
Multiple triggers on one sObject
Exactly 75% test coverage
Gigantic Flow instead of multiple Subflows
DMLs in loop
SOQLs in loop
No assertions in Tests
Unjustified big number of Record Flows on one sObject
No checking collection emptiness before DML
No Fault Paths in Flows
Hard-coded ID
Public Read/Write OWDs
Only catching general catch(Exception)
Hard-coding UI text instead of Custom Labels
Getting IDs by loop instead of Map(records)
SOQL without WHERE or LIMIT outside Batch
Method with 100s 'i++' lines for fake code coverage
