It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://www.linegames.org/ru/Math-Kids%3A-Math-Games-For-Kids-codes/280364560196/

  1. <!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="360"></head><body><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "www.linegames.org",cType: 'managed',cRay: '95a538660e79f24a',cH: 'gxpRIAwSg2X_Rtd6BMb2bFEd_t2q_.Fmqw6arfl9Dck-1751701289-1.2.1.1-1yQs5VRR6Mwt1oEGFRljxhq2FBytZFjKYOO5NqzfdrfBWadLGdpGjRARTM_8wWml',cUPMDTk: "\/ru\/Math-Kids:-Math-Games-For-Kids-codes\/280364560196\/?__cf_chl_tk=v_4jPpypvBL2m1J0MCtvHddKge9fnqmVAwhqVL5rjYE-1751701289-1.0.1.1-7I1DzDvhUZp635zhYfcLrBJYTj6nvRsDJO3KkbbXYoA",cFPWv: 'b',cITimeS: '1751701289',cTplC: 0,cTplV: 5,cTplB: 'cf',fa: "\/ru\/Math-Kids:-Math-Games-For-Kids-codes\/280364560196\/?__cf_chl_f_tk=v_4jPpypvBL2m1J0MCtvHddKge9fnqmVAwhqVL5rjYE-1751701289-1.0.1.1-7I1DzDvhUZp635zhYfcLrBJYTj6nvRsDJO3KkbbXYoA",md: "Py8GAoc_Wks1tZTC8Vxy.DFY2KsTtI845NbK8M63V_4-1751701289-1.2.1.1-VVSTWIy.zXThXMvA5ffsx3bIO6HYz7Ms9C1.0MNIi7wXjVYfNUzS3xmNmyQ6alrXIpQsGhgeQjOjZ7KLhYXNR61vqDWokYYsJ.DqOeB20o7bptKOeQ2Ie2EzcqJP1XtZeN.UrNSTDN4FsGCSOW4iA93bgplrz4h69RWMfjWBWLGiuMQDTPSov2awfosp6GZmdz17fW63YGRqSTTApWa9TH7eVCGAgoq2nIwDkndlrfgjq4ls2NiHwh0pyT3J6.z49rJETmV4nR_330bxDz6Dqf4VC3DYdQCT1AqachmmuDbOu800cDRW0AXvvHw0z7YGqj.WY7UAWqTYmbzJP6Sv7vz5g4TANyDE0o4dXI3Qj79WS4JRU9Tuw342x66qRrlCMQIIghvomcW5S2Rt_.IjhJxXUOEYe.QP0qSe02x8gKLy4VirsKu1oyOQFUgnF.B7mbwp_HcPZRvGNTWGwt8aNut._wR_bswbpfQPvIz2Zjy89dEmWJjvQra.V7Ymid0ooMM85IiMx2SgAk6JIPbb21afZPoLjFMeINtkrKl20CSPsLbSkzdqYQiTOj4SHwN0f.d5gxBtQQhF5TwXTSOdFVG4cCCmVYGA5JjWBOOiEr1rUhNzZq_oGivA8C3ZXV1q7KV.E3x4jRA1qkg9jPj3eDVKdi1kdROK6Jac8CKSOA3wV0Z.eEPaFes10D36mwmRQUFHkyGG6sQP9BbmixT.eHaTHUqcGi3aIxc9qm6MslnZ_k8elT72tP.Q5RAP7kNYtjFvTaGSSqM9E0yJomrZLvqOw5E507NQeeJkKnhP4xqZ6KxcQMT2REqd4.vYB7WtkOk.Q3qWyJVlkL1gpKwKgYoqakGnXWYWvEA6qjRpwhNxuCb9h2nKSurXoA4aFr0m",mdrd: "iijGUmr81JiOPquxg8h2vowsfZ.V7All3y9FeQDiKYE-1751701289-1.2.1.1-2YieAPhSPKkD5QuZTk.jzIZMMlkV.zE1Zh9R2GepeXQWt72R4igbI_5SQ_WkqR7sOzDyydcE4ApY6kVMB6VKchcsVAS_htuXV.QmBukpXE5VY5nJlSPyAh3Ca1VORCJJVgX7LgTmWpV01FFNqMJrI9UxRHpZD0viUdIWkJx3ek.9NxxuEqeIhzsgekttiSgT8MawoJ6qdiQCOxytP6oQkiEXJLSLrWtfzV.GX5jdTQSwFPab27IEJyxnTx9ht_DD3jyfyhcUMoB0SQSJf0UxfoCcgwASauJSXJAYqFPIlu8ZAiQw5vYqYV6KQUOB2KSGEhPt33j257j0zRKUexjk6Jsu8n9W49Lmp3nTJGRu_RELb9vnn1S6ooMQo8GXTHdM9qgvg3cNFRGcu.O4T8jw0Px0ZhECC5PEECN4WCoQVJVvAhwRy20hcIHLRzmX0sexezrBDbidl0fAl7s.fpZZhJw6mMGvy7Cy0IbodHKPAkUflryf2Dy8j40Y2SQuXj7k.zD2t0E0n8b7SbzwRgs5bE90SIEjscjlcIa8dG2bJpxjrni6ge8G7MLaMrxWto0SuC2A7_gSZg769QOlIGKja8gNwrU0STv4tYQxOLM4JjE7GkC0kZAQ1rB6lmH9_qoa.cBVGhC57fUvAYmTB1rCd32jbqXBBVsuYmoAMMKfAJmp_1Fk1kfPse03DrUzycZmKhO9VMdSgRImyneH.lzJI1Oe34qdjXFLvT6cVLO6gmxFG0vBQiDxsUwHHbN1MJKRLDuDyI16aLq1X_ibmUyaSQKH6hEEBfpqIuySx7mSd_XBpj1Y7rK2KhHRjVHBgahtVhVOtAd4qhGEGzzkc6xEgTJQ6ximfJJeoIrO3I9_j.vc0x3Wk4aL773Rf9grH9BB1bJEip9wXEW7pjURI2uCJSwRsmqzeS7BulP3Kj5CFKGtsbRS7swVP7eDicY_OorQ4VotrGeTh7CLw689Gi8kbTwSudtUsyZl0czjZxTwdA3nswYNvwyH7WDTn409o4FH_EDhgwXlvGKA9XcVuSLB7.LQ.7pM5fqop.n.q2NUzA99hP2.14vXs_AL5EiIAyzXs9Pj5ayzTLcD4sHQL7S30vJDOZszcPUzPbzAYa1CGYUFpoDfSPR9AVDb8r1Iqc9z8oQGOhHMh_Gss1cOUR5cKu.v1jH3pFoP0tkCq6wdguu8wSTakJ8iw2zJ4sOBvkbnZcB06qTOcsVJsqF3pfV0YCmOEvQpvv9i3PSS99coAyStQTHIBnLJ0K.7.eN52YwUifjT5PVXSikH3RScNoIta0NHzNoOU9MMN9eCzrV4OTfrsHFCWk_tCQkbrzPe2aOz.gIsEmYk.SdPiTmZWH6nK0sNwjVlPC2dJTedeufNZyq0HYqAXz2.5YviWoAUYA_2GmM1qVhQSO.GynU_uUav9NPgDVVwcIAawsuBns8SOaS1aAk.x3yB4Y2Df6BY7LXLrjl213dNk14tXS_eDigNYRCV_55PckpYOS7pVGxW9MJv9qMYBOBo3txirqTx2waVb.PmhA2tCQXFqFYUG5CS534m4dWBrY482Nk_DmFgixmGu0D_kOHLm1qRY9uZdixFCsI8XhmXI_5cWHGQbWASpZ9SQQJWyM.7gDqmLMejLMF8xU3Z5iwKx3pgigD5YtnkwFLiktTeKOSOJNM5WYIq6mk.kAdn_48pTa3_sgxh62dWaqNnriy3yymDvMYZXehbj5UTKQINpW2OFRkE00sLRmt.cpqgzQetIR1czlgiiLhVzk0deUYozCBqRrWf9Y_lVP8Xxbp_xmYwRvgWNzriTt4s5CsE0ttboYr.iTcpTZxE.VVQuMgZ0FIWd.ymwc1M4Pc6uSN07rqdXtMJIRf7jA",};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=95a538660e79f24a';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/ru\/Math-Kids:-Math-Games-For-Kids-codes\/280364560196\/?__cf_chl_rt_tk=v_4jPpypvBL2m1J0MCtvHddKge9fnqmVAwhqVL5rjYE-1751701289-1.0.1.1-7I1DzDvhUZp635zhYfcLrBJYTj6nvRsDJO3KkbbXYoA" + window._cf_chl_opt.cOgUHash);a.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(a);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda