As soon as you start the game, you'll be able to put in your name (eight letters max), then you'll be able to choose between the boy and the girl as the character that you'll play as. You'll then choose between Easy, Medium and Hard for your difficulty, then choose what kind of math problems you'll get. Multiplication and division don't show up until Episode 2. You'll then choose how much of your math problems will be word problems, or you can choose to skip the math problems altogether.
You'll then get the story. A bone-chilling crisis has struck the world! Reports are pouring in from all corners of the globe: missing numbers! Numbers were missing from speed limit signs and the frantic highway patrolmen couldn't stop speeders. On Wall Street, stock brokers were throwing up their hands in despair. The Dow Jones wasn't down, and it's wasn't up, it was gone!
Your own mother has closed herself in the bathroom and won't come out because her paycheck is inexplicably blank. You start to call your best friend, but the buttons on your phone are blank, and you can't remember your friend's number. Where will it end?!
Glancing out the window, you suddenly freeze with horror. A creature that looks like a giant nose with arms is standing in your driveway! It's stealing the numbers off your street address and loading them into a robot controlled garbage truck! Speechless with shock and rage, you point a quivering finger...
Before you can say "mystic intervention," a huge butterfly appears in the air and dumps a bucket of slime on the nose. In a flash, the nose disappears! You have discovered the secret to stopping the number stealers!
Grabbing a nearby garbage can lid for protection, and hoping the butterfly will continue to help you, tou embark on your mission to recover the stolen numbers and outwit the mysterious aliens. Yes, the fate of the world as we know it is in your hands!
Left and Right let you move left and right. Up and Down lets you climb ladders, and you can jump or climb up with Up or the Alt key. Space and Ctrl let you slime enemies in front of you, and you can use + and - to speed up and slow down the game, respectively. S toggles the sound, H brings up the help menu, Esc brings up the main menu, and Q lets you quit the game.
The object of the game is to reunite the numbers with their answers. You do this by jumping up and bumping a number icon. You will then get a math problem. Jump up under the numbers to input the digits for the answer from left to right. Answering questions correctly will give you more slime as well as reveal part of a picture of a key to the door leading to the next level. When you have the full key, find the door and press Up or Alt in front of it to enter the next level. Answering questions incorrectly will cause an extra Gruzzle to appear, which you'll have to avoid or slime.
There will also be a math problem at the bottom center of the screen. Finding the garbage trucking with the answer to that math problem and touching it will net you points. If you touch one with the wrong number, you'll lose a garbage can lid.
There are also secret bonus points that you can get in the form of various items such as watermelons, sailboats, crayons and more. Pick up toys and foods for points. You'll also find garbage can lids, which will act as extra hit points against the Gruzzles. You can carry up to 20 garbage can lids, and you'll lose one whenever a Gruzzle touches you. If you have no lids when a Gruzzle touches you, or if you fall into a bottomless pit, you'll have to replay the level from scratch. Thankfully, you have infinite lives.
When you see a Gruzzle, press Space or Ctrl to point the Gruzzle out to Benny so he can slime them, assuming you have any slime. If you have no slime, or if there is no Gruzzle in your direction, Benny will just appear and shrug before disappearing again. Keep answering math problems correctly to get more slime.
On Easy, you'll need to answer ten math problems before getting the key to the door to the next level. You'll get a slime for every problem you solve, and Gruzzles will not be very good at chasing you. Gruzzles will re-spawn on this difficulty. Medium is much like Easy, except you must complete all twenty math problems and Gruzzles do not re-spawn when slimed, and Gruzzles will be a little bit smarter. Hard is much like Medium, except you get a slime for every two problems solved, and garbage can lids come into play. The Gruzzles will be at their smartest, and unlike on Medium, they will re-spawn after being slimed.
There are secret passages throughout the levels. Be ready to look around and explore the level to find them.
Sadly, Gruzzle Puzzles and Invaders From Glixer were never released.
Level 1: You Follow the Gruzzles Undersea
If you collect all ten numbers from 0 to 9, you'll get bonus points for collecting them in order.
Watch out for "Danger" signs, as they usually indicate that bottomless pits are nearby. If you fall into a bottomless pit, you're restarting
For word problems, words and phrases such as "the sum of" or "altogether" indicate addition problems. "How many are left?" or "How many did you lose?" indicate subtraction.
White panels with the word "warp" on them will warp you to other areas. You'll need to use these panels to find everything.
After every level is a bonus round. You'll have 30 seconds to get as many math problems correct as you can. You'll always get one type of math problem (addition, subtraction, multiplication, division), which makes things a little easier. The more you correctly solve, the more garbage can lids and slimes you'll be able to get. You'll get one slime for every four and one lid for every eight, and unlike Word Rescue, you can carry a lot more slimes.