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