couldn't muster 400,000 sales between them.

[Nathan Mckane]

What's the meaning of the part in bold?

The publisher's other games, Taiko Drum Master, Ben 10 Alien Force and Super Robot Wars couldn't muster 400,000 sales between them.

Thanks.

 

[konungursvia]

It means they were unable to gather, achieve, or count that number of sales, even if added together.

 

[sglowski]

"Muster" means accumulate or gather together.