spielerisch
effortless
Describes an action that is carried out with great ease and without visible effort, almost as if it were a game.
Sie löste die komplexe Aufgabe mit spielerischer Eleganz.
She solved the complex task with effortless elegance.

playful / effortless
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effortless
Describes an action that is carried out with great ease and without visible effort, almost as if it were a game.
Sie löste die komplexe Aufgabe mit spielerischer Eleganz.
She solved the complex task with effortless elegance.

The word is derived from 'das Spiel' (game/play). The ending '-erisch' turns the noun into an adjective and means 'in the manner of a game'.
Er hat eine spielerische Art, mit Problemen umzugehen.
He has a playful way of dealing with problems.
'Spielerisch' (playful/effortless) is very often used as an adverb to describe HOW an action is carried out. It answers the question 'Wie?' (How?).
Der Pianist meisterte das schwierige Stück ganz spielerisch.
The pianist mastered the difficult piece completely effortlessly.
In the meaning 'mühelos' (effortless), it is often combined with abilities and achievements. Typical phrases are 'spielerische Leichtigkeit' (effortless ease), 'etwas spielerisch lösen' (to solve something effortlessly), or 'spielerische Eleganz' (effortless elegance).
Mit spielerischer Leichtigkeit gewann sie das Tennismatch.
With effortless ease, she won the tennis match.
This meaning is almost always found in the context of pedagogy and learning. A typical formulation is 'auf spielerische Weise' (in a playful way) or 'etwas spielerisch lernen' (to learn something playfully).
Die App bringt Kindern spielerisch eine neue Sprache bei.
The app teaches children a new language in a playful way.
light / easy
'leicht' and 'spielerisch' can both describe something succeeding without much effort. 'leicht' simply says that something is not difficult. 'spielerisch' goes one step further: it sounds as if someone does something very confidently, casually, and almost as if it were a game. That is why 'spielerisch' often fits in contexts like sports, music, learning, or skill. 'leicht' is more neutral and can be used for almost any easy task.

Sofia löste die schwierige Aufgabe spielerisch und erklärte sie danach der Gruppe.
Sofia solved the difficult task effortlessly and then explained it to the group.
Der Test war leicht, weil wir alle Themen vorher geübt hatten.
The test was easy because we had practiced all the topics beforehand.