The ending is a bit weird. On page 85 Ryuk thinking to himself whether to tell Minoru about the new rule. It's internal monologue which means it is accurate and he ultimately decides against it because Minoru told Ryuk not to contact him anymore. If the rule was fake or didn't apply to Minoru, there was no reason to tell Minoru in the first place. So the rule should be real and apply to Minoru. However, at the end it shows Ryuk writing Minoru's name in a Death Note which suggests that Minoru did not die from selling the Death Note. I guess this still works out if Ryuk killed him just before Minoru would have died from breaking the rule or the rule isn't automatic and Ryuk was given the job of carrying out the punishment. ---
Link isn't the only one who kicks ass. Congrats to Advokaiser for winning the CBX Guru Contest!