Freddi and Luther move from one screen to another by clicking where the cursor turns into a chunky arrow. When the cursor is just a small cursor outline then there is nothing clickable, but when the small cursor outline fills in, something happens when clicking the mouse. As with all Humongous Entertainment games, clicking on the environment prompts an animation which is sometimes funny but irrelevant to the plot. However, when a person or certain objects are clicked, something will happen like the person talking or Freddi Fish picking up the object. Collected objects appear on the bottom of the screen in their own individual bubbles. Freddi Fish puts objects away by sweeping them behind her back, often resulting in hilarious scenes when putting away large objects. Overall, Freddi Fish Junior Adventures are mainly about helping solve others' problems which are tied into a constantly progressing storyline.
In all the Freddi Fish games except the second game (Haunted Schoolhouse), the game has some area to solve one last challenge, that is only accessible when accomplishing the "initial" objective—the objective given near the start of the game. Once this area is reached, the player is locked in there and from the third game (Stolen Conch Shell) onwards, any leftover stuff is taken away.
The third and fourth games end with a mystery to find out who was the thief. In the third game, they give one or two clues that point to the personality of one person; in the fourth game, a clue in the Hogfishes' room points to an object the person had been using.
I think mine was probably like Sonic the Hedgehog on Genesis.