Logic Masters Deutschland e.V.

Renban: Cells connected by purple (or grey) renban lines form a set of consecutive, nonrepeating digits in any order.

Skyscrapers: Consider each digit in the grid as a building of that height. Clues outside the grid give the number of buildings that can be seen from that direction, with larger buildings hiding smaller ones.

Solve online:
F-puzzles
Penpa+ (Note: in Penpa, renban lines are grey, not purple)
CtC app