Worst game are affect by many criteria's. Look into your chess insights to find what is worst.
Tactical Awareness:
lichess.org/insights/Toscani/awareness/phasePositional Understanding: Pawn structure, Controlling the center, Exploit weaknesses, Optimal squares.
Should a percentage be higher or lower in one of the phases?
lichess.org/insights/Toscani/piece/phaseOn average my opponents fails to punish my mistakes 31 % of the time. The worst games would have a much lower value than that. If you see a chess insight lower than that, than you should be able to post many games that are worst than others.
lichess.org/insights/Toscani/luck/phaseMove Quality: Errors, Blunders. How many candidate moves where there when you blundered or made errors?
My middle games ar ehte least accurat.
lichess.org/insights/Toscani/accuracy/phaseTime Management:
Pondering time ...
lichess.org/insights/Toscani/movetime/phaseTime trouble ...
lichess.org/insights/Toscani/clockPercent/phase/variant:bulletUnused time ...
lichess.org/insights/Toscani/movetime/clockPercentEndgame Technique: Games that did not reach the end game are bad, worst is the ones that did not make it out of the opening.
So I had to do a search to find my worst game at my most favorite time control. The opponent either had to match my rating or be lower than my rating. I also had to be checkmated.