 While playing the game during development , Rubin realized that there were many empty areas in the game due to the PlayStation 's inability to process numerous on @-@ screen enemy characters at the same time . Additionally , test players were solving the game 's puzzles too fast . In an attempt to remedy this , the " Wumpa Fruit " pickup was created ( the fruits themselves were rendered in 3D into a series of textures ) , but was not exciting enough on its own . On a Saturday in January 1996 , Gavin coded the " crates " while Rubin modeled a few basic crates and an exploding TNT crate and drew quick textures . The first few crates were placed in the game six hours later , and many more would be placed during the following days . 
