18 year old Juri is seriously addicted to online gaming, so much so he becomes isolated from his single mother and pushes his girlfriend to the brink of leaving him. He decides to quit, but is soon lured back by one of his net-mates, Niki, who - when they meet for the first time - turns out to look strikingly like Juri. Niki has a web-address tattooed on his arm and when Juri types it into his computer, he gets drawn into a curious game that grants him the username RAT KING. As the game becomes increasingly dangerous, Niki vows to help Juri get through it. But the game triggers a series of life-threatening events and pretty soon Juri realizes that he is gaming for his life.
Unfortunately the movie Rat King is not yet available on HBO Max.
| Writing | Petri Kotwica | Writer |
| Directing | Petri Kotwica | Director |
| Sound | Olli Pärnänen | Sound Re-Recording Mixer |
| Sound | Lauri Porra | Original Music Composer |
| Production | Kai Nordberg | Producer |
| Costume & Make-Up | Anu Lensment | Costume Design |
| Writing | Iiro Küttner | Writer |
| Production | Ivo Felt | Producer |
| Costume & Make-Up | Tiina Leesik | Makeup Designer |
| Sound | Ivo Felt | Sound Designer |
| Sound | Seppo Vanhatalo | Sound Designer |
| Editing | Harri Ylönen | Editor |
| Production | Kaarle Aho | Producer |
| Costume & Make-Up | Hanna Minkkinen | Makeup Artist |
| Production | Birgit Demidova | Location Manager |
| Art | Juhan Malmstein | Set Designer |
| Camera | Ants Martin Vahur | Steadicam Operator |
| Art | Jaagup Roomet | Production Design |
| Sound | Heikki Kossi | Foley |
| Lighting | Jani Pinomaa | Gaffer |
| Directing | Kadri Kilp | Second Assistant Director |
| Camera | Mika Orasmaa | Director of Photography |
| Directing | Ralf Siig | First Assistant Director |
| Production | Kristjan Pütsep | Assistant Location Manager |
| Crew | Roman Neso Laupmaa | Stunts |
| Art | Karin Tetsmann | Property Master |
| Crew | Margus Terasmees | Special Effects Technician |
| Sound | Tapio Liukkonen | Assistant Foley Artist |
| Sound | Kristian Miilen | Boom Operator |
| Crew | Enar Tarmo | Stunt Coordinator |
| Editing | Marko Terävä | Colorist |
| Editing | Juuso Selin | Online Editor |
| Crew | Raine Toikkanen | Special Effects Technician |
| Production | Camilla O'Connor | Line Producer |
| Camera | Jani Pinomaa | Key Grip |
| Sound | Seppo Vanhatalo | Sound Editor |
| Sound | Seppo Vanhatalo | Sound Re-Recording Mixer |
| Sound | Seppo Vanhatalo | Production Sound Mixer |
| Camera | Roland Adamson | Focus Puller |
| Camera | Mika Orasmaa | Still Photographer |
| Crew | Tuomas Helminen | Special Effects Technician |
| Lighting | Alvar Kõue | Best Boy Electric |
| Lighting | Wellu Mikkonen | Electrician |
| Lighting | Jonatan Marila | Electrician |
| Lighting | Kari Malmio | Electrician |
| Lighting | Mika Hietala | Electrician |
| Lighting | Venno Kornak | Electrician |
| Lighting | Silver Soe | Electrician |
| Lighting | Volmer Kliimand | Electrician |
| Lighting | Ivar Taim | Electrician |
| Lighting | Aivo Rannik | Electrician |
| Lighting | Ott Tiigirand | Electrician |
| Costume & Make-Up | Liisi Põllumaa | Assistant Makeup Artist |
| Costume & Make-Up | Siiri Lauri | Assistant Makeup Artist |
| Camera | Eduard Pissarenko | Dolly Grip |
| Camera | Edgar Pissarenko | Grip |
| Camera | Dimitri Gunar | Assistant Grip |
| Sound | Tarvo Schmeimann | Sound Assistant |
| Crew | Anu Uibo | Catering |
| Crew | Reijo Sõmer | Driver |
| Crew | Marek Maaker | Driver |
| Crew | Anti Reivart | Driver |
| Crew | Hard Arnim | Driver |
| Art | Petteri Meriluoma | Graphic Designer |
| Art | Margus Tammik | Graphic Designer |
| Art | Asko Linno | Property Master |
| Art | Tõnis Tallermaa | Property Master |
| Art | Peeter Sepp | Set Decoration |
| Art | Anne-Mai Heimola | Set Decoration |
| Art | Liisa Tetsmann | Set Decoration |
| Costume & Make-Up | Ave Kuik | Costumer |
| Production | Hard Arnim | Assistant Location Manager |
| Editing | Salla Kotiranta | Assistant Editor |
| Camera | Niina Mattus | Camera Operator |
| Camera | Raimo Paananen | Focus Puller |
| Crew | Kaarel Kübarsepp | Prop Maker |
| Crew | Taivo Müürsepp | Prop Maker |
| Crew | Konsta Mannerheimo | Special Effects Coordinator |
| Crew | Rinald Kodasma | Special Effects Technician |
| Crew | Brandt Pukk | Special Effects Technician |
| Crew | Armin Altorf | Special Effects Technician |
| Crew | Vassili Raud | Special Effects Technician |