LEGO® Batman The Videogame™ The Riddler: Plan Analysis
Okay, first things first I guess... Mr. Nygma plans to steal a huge sum of money from a high security building. He chooses his team carefully for the most part. In order to stage the heist he must come into the possession of: an access key, a freeze cannon, two Poison Ivy seeds and a powerful cannon. He takes Clayface with him to steal the key. Next he takes Mr. Freeze back to his old lair to get Mr. Freeze's old freeze cannon. After that he takes Poison Ivy to get the seeds and Two-Face for the cannon. He always stays behind after Batman and Robin arrive. This is most likely due to waiting for Two-Face to pick him up. He made lots of good choices right up until the end when they were caught off guard in the Master Vault.
How does he manage to afford all those henchmen? He probably promised them money that he'd get from his heist. Anyway, that was a rough look at his plan from the game.