Waylay is free and shows no ads. Runs of 10 waves, ranks, Daily Challenge and goals cost nothing. If you want more, you can buy Endless Mode and cosmetics once.
Tap Endless in the menu. If you have not bought Endless Mode yet, you see what it offers and can buy it there. Otherwise Start Endless starts a run.
You play as usual, it just does not stop after wave 10: the waves keep getting bigger and tougher, every 3 waves there is a relic and every 10 waves a boss. The run only ends when your lives run out. In Endless Mode you can also raise towers to levels 4, 5 and 6 (80, 160 and 320 gold).
Every wave cleared in Endless Mode gives 1 XP. Going from level 1 to 2 takes 6 XP, every further level 2 more. Every level gives you a point that you put on a bonus with + before you start. Bonuses apply to all later endless runs:
Each bonus takes up to 4 points. Once all 16 are spent, further levels count towards Mastery and unlock castle roofs you can use in every mode.
Under Shop in the menu there are three one-time purchases. What you buy once is yours for good:
The button shows the price in your currency, for example Buy · $2.99. Payment goes through Google Play; we never see any payment details. If the button says Pending, Google is still waiting for the payment (for example a cash payment); the item unlocks as soon as it arrives. You choose your castle roof with the Castle roof button.
Purchases belong to your Google account. Every time the app starts or you return to it, the game asks Google Play for your purchases and unlocks them. On a new phone or after reinstalling, tap Restore in the shop if something is missing. Your save and stats do not move with it; they stay on the old device.
With Funny Faces every enemy type (Grunt, Runner, Samurai, Boss) gets a picture. In the shop, under Edit Faces:
Your photo stays on your device. The game needs no permission for it, it only receives the one picture you choose and keeps a small round copy of it.