Thanks for your reply <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">
I open to both solutions. Moving or jumping are both fine (but moving would be best I guess) as long as the pawn doesn't disapear.
I have come myself to a "jumping solution" but the problem is that the pawn disapear between two jumps: http://pixelimpact.org/ebola/game1/index.html
I have also tried a pathfinding solution but the pawn go only straight in line and get stuck on the wall without no reason...: http://pixelimpact.org/ebola/game2/index.html
(Why I can't post .capx on the topic?)
What is lerp exactly? Even with explanations https://www.scirra.com/forum/what-is-lerp-2-minute-tutorial-for-the-non-math_t60509 I can't understand...
And yes I'm aware it's a morbid game... It's an awareness game use in West Africa by the Red Cross to teach people how to protect themvelse from Ebola.
So I guess Construct and game making can also save lives <img src="{SMILIES_PATH}/icon_cool.gif" alt="8-)" title="Cool">
Thanks again!