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