There is a good system of snow-covered paths to walk over the glacier of Mount Titlis and in the first moment it is not always easy to understand, why you would not be allowed to leave these marked paths. But there are crevasses at many places and maybe they are covered by just a thin,fresh layer of snow so you will not see them right away...
Please keep in my mind, that any rescue-activities have to be payed by the incautious tourists, and most of the insurances will not pay anything, when you had left the ordinary mountain-paths and got into big danger all by yourself !
Since Titlis is popular for both tourists and winter sport fans,you'll have to expect people travelling with their ski equipment, e.g. ski sticks etc.Be very careful,coz you might get hit with their ski sticks or step on by their ski boots.Ouch;)!!!