Leikkiluola is an indoor playground 30 metres below the Hakaniemi market square in Helsinki. Around 1000 square metres of play space best suits children under 10, and the compact layout makes it easy for adults to keep an eye on kids. The setup includes a large adventure maze, a single big trampoline area, a multi-game court, tube slides, bouncy castles, a ball-cannon arena and a Lego building point. A separate area is set aside for children under 3. A 7-metre climbing wall and a dedicated toddler trampoline sit at the end of the trampoline area. Visitors enter through the glass pavilion on Hakaniemi square and take a lift down. Metro, bus and tram stops sit within 100 metres. The underground location makes it a reliable rainy-day and winter option in central Helsinki.