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