《古墓丽影1》早期技术预览版（Pre-Alpha version）演示的原始视频，当时游戏应该还处于技术印证阶段，通过这个视频对比实际发布版本，我们可以知道非常多游戏在开发过程中的变化。
1.正如“劳拉之父”托比·加德构想的那样，劳拉一开始其实有长辫，而且在技术上已经实现了跟随劳拉的动作进行摆动（在攀爬时较为明显），与《古墓丽影2》中的长辫很相似。不过长辫增加了大量的多边形贴图，对当时的游戏主机来说，无疑会影响运算性能，最终正式版取消了长辫设定，将劳拉的头发盘在了脑后。
2.预览版中劳拉一直带有她标志性的红色圆框墨镜，正式版则是在劳拉踏进山洞时就摘下了，全程再未出现。
3.现在不能确定视频中的配乐是原本就有还是后来添加的，但至少音效肯定是原视频的，说明在技术验证阶段音效，甚至配乐工作就已经开始了，并且和正式版非常接近。
4.视频里跑动中的劳拉转向时其实是地面直接旋转，脚步动作并未因为转向而变化，但在正式版中劳拉脚步的落点会根据转向方向有所变化，动作更为真实。
5.视频里劳拉原地起跳前有一个双臂摆动的动作，正式版中没有。
6.预览版中劳拉跳跃在空中的时间明显过长，正式版修正后动作更为流畅和真实。
7.预览版中劳拉已经可以举枪锁定敌人了，当敌人位于身体一侧时相邻一侧的枪会一直对着敌人。但与正式版稍有不同的是，离敌人较远的一只手一直是平举，而正式版中劳拉会收回那只手。在视频提供者说明中提到预览版中劳拉可以锁定两个敌人，但视频中并未真正看到劳拉用枪指着两个不同方向的敌人，在正式版中劳拉也只能锁定一个敌人。
原视频说明：
Pre-Alpha version of the original Tomb Raider preserved by fansite Planet Lara.
From the Webmaster: "This is the pre-alpha build of the original Tomb Raider. It's not a level as such, rather a collection of vast chambers and chasms styled in what would later become the Vilcabamba level textures. It is believe that it was produced to give Eidos a preview of what the game engine was capable of. This build is particularly unique and interesting for a number of reasons. Lara was sporting her iconic braid, which was later removed as it added too many polygons to the game. Not only that, but Lara is also sporting her iconic sunglasses too! Other unique and interesting features included in the pre-alpha were the ability to dual aim - Lara is able to target two different enemies at once, although these particular enemies don't attack. The camera syetem started out differently too - the player is given the ability to zoom and pan the camera in any which way they choose - pretty tricky to get to grips with, but useful for creating some unique shots. Lastly, the jump animation was completely changed. In this build the jump is far more exaggerated. Lara is unable to simply jump straight up in the air, instead she bends her knees, swings her arms and propels herself into a full Matrix-style leap across the map." - Daniel Barnes
