Core Design improved and modified the character with each instalment. Developers for "Tomb Raider II" increased the number of polygons in the character's model and added more realistic curves to its design. Other changes included new outfits and manoeuvres. Core Design reportedly planned to implement crawling as a new gameplay option, but the option did not appear until "Tomb Raider III". Actress Judith Gibbins took over voice acting responsibilities and stayed on through the third game. For "Tomb Raider III", the developers increased the number of polygons in Croft's 3D model to about 300, and introduced more abilities to the gameplay. Core Design wanted to reintroduce the character to players in "Tomb Raider: The Last Revelation" and included a flashback scenario with a younger Lara. The developers expanded the character's set of moves threefold to allow more interaction with the environment, like swinging on ropes and kicking open doors. The character model was altered to feature more realistic proportions, and Jonell Elliott replaced Gibbins as the voice of Lara Croft. By the time development for "The Last Revelation" began, Core Design had worked on the series constantly for four years and the staff felt they had exhausted their creativeness. Feeling the series lacked innovation, Core Design decided to kill the character and depicted Croft trapped by a cave-in during the final scenes of the game.