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