There are a lot of games at Quarterworld, Portland's newest jam-packed pinball and arcade game paradise.

How many, exactly? Counting is a challenge, for every time you get past 15 or so, some flashy graphic or intense sound effect takes your attention away. Their complexity ranges from the simple screen in Asteroids to the immersive, seat-moving tank battle of Panzer Elite Action.

There are classics like Donkey Kong (even if it's been modified to play as Pauline saving Mario) and modern arcade musts like Big Buck Hunter.

Then, of course, there are the obscure. The kind of games no layperson would ever dream existed.

So ahead of Quarterworld's grand opening 3 p.m. Friday, April 8, The Oregonian/OregonLive asked Quarterworld's Director of Operations Logan Bowden to point out some of the rarest games in the room. All turned out to be must-plays, but here are five standouts to look for.

Ninja Baseball Bat Man: A side-scrolling beat-'em-up game that feels a bit like the Teenage Mutant Ninja Turtles, except you play as ninja baseball players fighting humanoid sporting equipment.

Toobin': A video arcade's answer to a summer day on the Clackamas River. Race your inner tube down stream, taking care to dodge fishermen and throwing beer cans to slow your opponent.

Black Hole: An uber-challenging, two-tiered pinball game set in deep space. Probably also named for its ability to make quarters disappear.

Demolition Derby: This four-player version of the popular cocktail table game lets you steer your car into everyone else's. It's kind of like video bumper cars, but you lose parts and blow out your engine throughout the round.

Granny & The Gators: Another rare, river-based find that's a video game and pinball game in one. Paddle Granny down a jungle river, dodging arrows and hungry gators, then jump into pinball mode for extra points and power-ups.

Quarterworld opens 3 p.m. April 8 at 4811 SE Hawthorne Blvd. The arcade is open to all ages until 8 p.m. daily, when it's only open to those ages 21 and over.

--Dillon Pilorget

503-294-5927