If you want to take the Hacking Device into Ye Olde Coocoo (the pub), you'll have to deal with the Bouncer.

Have you noticed that the Bouncer outside of Ye Olde Coocoo looks a little familiar?

They look exactly like the Bouncer in front of the Party.

They both wear Glasses.

They both wear their Glasses when interacting with you.

The Bouncers refer to themselves as we, not I.

The Bouncers are the same entity. (For all intents and purposes. In the story, they are chemically engineered twins/triplets, somehow.)

If you can ruin the Glasses of the Party Bouncer, the Bar Bouncer's glasses will also be ruined.

The Party Bouncer washes their Glasses in the Glass Wash on the table.

Can you change the colour of the liquid inside?

Put Ink into the Glass Wash.

The Ink is in the Alleyway behind Ye Olde Coocoo.

Take your Hacking Device into Ye Olde Coocoo. The Bouncer (who is, apparently, both Bouncers) can no longer see well because their glasses are covered in Ink.

Use the Hacking Device on the Arcade Game.

The Hacking Device allows you to jump over and over, including while you're in the air. Use this new ability to "fly" through the air at the end of the level.