
I had to figure it out myself. I read other reviews and knew it was true. See attached photos. There is a secondary fill port that is separate from the flush port. It's wider and needs to be squeezed to open the hole. Ideally you should fill it with water before blowing it up with air, but I found the hole after blowing the game. He needs a lot of water before he becomes independent. If you don't have enough water, the product has a slight tilt as shown in my photo (but it works quite well in this case too!). People are disappointed with this product. My nephew loved playing with it and when it included a water base he loved just knocking it over even more! Overall a good product but needs better instructions!

Indoor Hover Soccer Set - Perfect Gift For Kids Ages 2-8 | Includes Football, Basketball & Pump!
34 Review

NIGHTMATCH Premium LED Light Up Basketball - Perfect Glow In The Dark Basketball Size 7 With 2 LEDs, 8 Batteries & 1 Pump - Glow Basketball With Water Resistance - Birthday & Christmas Gifts For Kids
35 Review

Get Your Kids Active With Meland Indoor Mini Basketball Hoop With Electronic Scoreboard And Accessories
28 Review

Toy Story 4 Bop Bag Inflatable Punching Bag & Gloves Set - 36In Hedstrom
42 Review

Zippered FoxPlay Basketball Ball Pit: Unleash Fun and Excitement!
9 Review

Fun And Safe Playtime With PlayMaty 100 Colorful Pit Balls For Kids
30 Review

Dynamic Movement Sensory Sox For Kids 6-9 Years - Updated Version, Medium, 47''LX27''W Green By Sanho
22 Review

GOGOSO Pink Balls For Ball Pit - Pack Of 100 Ball Pits Ball Pink, BPA Free Plastic Ball Toys Crush Proof Ocean Balls Phthalate Free For Girls Toddlers Indoor Outdoor - Pearl Pink Colors
10 Review