Offspring Fling! is a puzzle platform game. A monster has scared away all of a mother's furry children and she has to retrieve them. The game contains more than one hundred levels and each contains a number of children. The title references the main gameplay mechanic as the mother needs to pick up her children and throw them to get them to the door that exits the level. The children can also be picked up and be stacked, but this lowers the jumping height of the mother. When a child is thrown it always travels into a straight horizontal line until an obstacle is hit. They can also be dropped to remain in a specific spot to block a barrier or to keep a button pressed. Later levels introduce hazards such as spikes and deadly green liquid. There are often buttons that cause barriers to appear or disappear. All children need to be carried or flung at the exit door to complete a level, but they do not need to be carried all at once.
Completing levels earns flowers that are used to open up new environments. Next to the blue flowers gold and rainbow flowers can also be earned for additional secrets. Replays can be saved as text strings. These can be shared with other players to see how a fast time was achieved.